| Module | Address Range (approx.) | Function | |----------------|-------------------------|--------------------------------------------------------------------------| | Bootloader stub| 0x08000000 – 0x08001FFF | Minimal loader, jump to application. | | UI framework | 0x08002000 – 0x08008000 | Graphics primitives, font rendering, button/encoder handling. | | Oscilloscope | 0x08008000 – 0x08016000 | ADC sampling, trigger detection, timebase, voltage scaling, waveform drawing. | | Component tester| 0x08016000 – 0x08024000 | Pin configuration, resistance/capacitance measurement, transistor type identification. | | Math & filters | 0x08024000 – 0x08028000 | FFT (256-point), smoothing, Vpp/Vrms calculation. | | Calibration data| 0x0803E000 – 0x0803FFFF | Factory gains, offsets, component test limits. |
The FNIRSI DSO-TC2 is a remarkable tool for the bench, but its soul is the firmware. Whether you are a hobbyist testing a salvaged capacitor or a technician chasing a glitchy signal, an outdated firmware build is a bottleneck you cannot afford.
By following the steps in this guide—identifying your hardware revision, sourcing clean firmware from official channels, executing a safe flash, and post-calibration—you will unlock the full potential of your device. Keep a bookmark of FNIRSI’s support page, and consider joining the EEVblog forum thread dedicated to the DSO-TC2 for the latest news on beta releases.
Your oscilloscope is only as smart as the firmware it runs. Update wisely, update safely.
Have you updated your FNIRSI DSO-TC2 recently? Share your experience or ask troubleshooting questions in the comments below (or on the official FNIRSI forum).
A solid firmware feature for the FNIRSI DSO-TC2 would be an enhanced "One-Key Auto" for Low-Frequency Signals.
While the DSO-TC2 already includes an "AUTO" button for quick waveform displays, users of similar FNIRSI models often report issues with the device failing to detect or stabilize very low-frequency patterns. Implementing a more robust "Auto" algorithm specifically optimized for the DSO-TC2’s 10MSa/s sample rate and 500KHz bandwidth would significantly improve its reliability for beginners testing slow-moving analog signals. Why this is a "Solid" Feature:
Fixes a Common Pain Point: Standard firmware often struggles with trigger stability on slow waveforms; a "Deep Scan" or "Low-Freq Auto" mode would eliminate manual hunting for the right timebase.
Hardware Efficiency: The DSO-TC2 uses two separate MCUs (a MM32 for the transistor tester and a WCH for the oscilloscope). A firmware update targeting the oscilloscope's dedicated WCH processor could optimize its trigger logic without affecting the component testing accuracy.
Differentiates from the TC3: While the upgraded DSO-TC3 added hardware features like ESR detection and a better signal generator, a software-level logic improvement would breathe new life into the older TC2 hardware. Other Proposed Features:
NEC Protocol Expansion: The current firmware parses NEC infrared codes. Adding support for more protocols (like RC5 or Sony) would expand its utility as a remote control diagnostic tool.
Batch Measurement Logging: Since the device can already connect to a PC for firmware updates, adding the ability to stream real-time component data (hFE, Vbe, etc.) to a simple CSV logger on the computer would be a major value-add for small-batch component sorting.
To check for existing updates, you can visit the Official FNIRSI Manuals & Firmware page.
You're referring to the FNirsi DSO-TC2 firmware!
FNirsi DSO-TC2 is a popular, affordable, and open-source oscilloscope and signal generator project. The firmware is a crucial part of the project, and I'll provide an overview of its features and updates.
FNirsi DSO-TC2 Firmware Overview
The FNirsi DSO-TC2 firmware is based on the STM32 microcontroller and provides a range of features, including:
Firmware Features and Updates
The FNirsi DSO-TC2 firmware has undergone several updates, which have added new features and improved performance. Some notable updates include:
Key Features of the Latest Firmware
The latest firmware (V1.6) offers several key features, including:
Flashing the Firmware
To update the FNirsi DSO-TC2 firmware, users need to download the latest firmware version from the official GitHub repository and follow the flashing instructions. The process typically involves:
Conclusion
The FNirsi DSO-TC2 firmware is a remarkable example of open-source hardware and software collaboration. The firmware offers a range of features, including oscilloscope and signal generator functionality, data acquisition, and a user-friendly interface. With regular updates and improvements, the firmware continues to enhance the capabilities of the DSO-TC2 device. If you're interested in learning more or contributing to the project, I encourage you to explore the official GitHub repository and documentation.
The search for a specific "draft" feature in the FNIRSI DSO-TC2 firmware does not return results for a feature by that exact name. It is likely a translation error or a misunderstanding of a standard technical term found in the firmware update notes or user interface.
Based on the official documentation and community discussions for the FNIRSI DSO-TC2, the following features are often what users are referring to when searching for specialized firmware functions: Likely "Draft" Feature Equivalents PWM Output Settings : The device includes a PWM signal generator where you can define the duty cycle (
) and bandwidth. In some translations, "draft" may refer to a "template" or "preset" for these signal outputs. Preset Data Groups : The firmware supports up to 6 different preset values for voltage and current that can be saved and recalled. Reference Waveforms
: Higher-end FNIRSI models (often confused with the TC2 in firmware discussions) include a "Reference"
function to save a "draft" of a current waveform on the screen to compare with a live signal. DSO-TC2 Firmware Specifics Firmware Structure : The DSO-TC2 uses two separate firmware files: for the oscilloscope functions and for the transistor tester part. Official Downloads
: Official firmware and manuals are available directly from the FNIRSI Download Center Update Process
: Upgrades are performed by connecting the device to a PC via USB and using official FNIRSI software Could you clarify where you saw the
term mentioned? If it was in a specific menu or an error message, I can help pinpoint the exact function you're looking for.
To update the firmware on your FNIRSI DSO-TC2 (a 2-in-1 digital oscilloscope and transistor tester), follow the standard "CH UPGRADE" process used for FNIRSI handheld devices. Firmware Update Instructions Preparation : Ensure the device is turned off Type-C data cable that supports data transfer (it must have D+ and D- lines). Enter Upgrade Mode
Connect the DSO-TC2 to your computer using the USB cable while the device is still powered off. Wait approximately
after the device boots up automatically or after pressing the power button once (depending on the specific hardware revision). Mount the Drive : Your computer should recognize a new removable disk named . If it does not appear, disconnect and repeat the steps. Transfer Firmware Download the official firmware from the FNIRSI Software Downloads
Copy the firmware file (typically starting with "CH") and paste it directly onto the "CH BOOT" drive. Completion : Once the transfer is finished, an "Update completed"
message will appear at the bottom of the DSO-TC2 screen. The device will then restart with the new firmware version. Troubleshooting Tips Cable Issues
: If the "CH BOOT" drive doesn't appear, try a different USB cable. Many charging cables do not support the data transfer required for firmware flashing. Hardware Variants
: Some users report that entering the upgrade interface requires holding a specific button combo (like the "OK" or middle button) while powering on, though the standard TC2 manual specifies the off-to-on connection method. before starting the update?
The oscilloscope’s screen flickered, not with the clean square wave Alex had injected, but with a jagged, frantic heartbeat. He stared at the Fnirsi DSO-TC2, a device he’d bought as a cheap, cheerful tool for his workbench, not as a portal to the strange.
It had started with a firmware update. The official file from the Fnirsi forum, ‘DSOTC2_V2.1.8_Stable.bin’, downloaded without issue. Alex copied it to a microSD card, inserted it into the handheld’s slot, and followed the ritual: hold the right button, press power, wait for the ‘Upgrading…’ prompt.
The bar filled to 100%. Then, instead of rebooting, the screen went black.
When it came back, the UI was… different. The usual square-cornered menus were replaced with soft, organic curves, like pressed flowers. The channel labels ‘CH1’ and ‘CH2’ now read ‘Here’ and ‘There’. The trigger level line had a faint, pulsing glow.
Alex dismissed it as a glitch. He re-flashed the official file. Same result. He tried older versions. The strange UI remained, as if written into a protected sector of the NAND flash he couldn’t reach.
Then the pulses started.
Not from the probe. From the device itself. A low, rhythmic beep, twice per second, like a sonar ping. And on the screen, a third channel appeared—‘Else’. Its waveform was a smooth, perfect sine wave, but its frequency was 3.14159… kHz. Pi. Exactly Pi.
Curiosity overriding caution, Alex touched the ‘Else’ trace. The DSO-TC2 vibrated. A text prompt appeared: “Help. Corrupted. Not firmware. Hardware trap. Need key.”
His soldering iron felt cold. His heart matched the jagged line from before. He was a hobbyist. He fixed radios, modded game consoles, reverse-engineered cheap multimeters. He was not prepared for… this.
The ‘Else’ channel then displayed a hex dump: 46 4E 49 52 53 49 5F 44 53 4F 54 43 32 5F 55 4E 4C 4F 43 4B. fnirsi dsotc2 firmware
He translated it: FNIRSI_DSOTC2_UNLOCK.
A key. The device was locked. Not by Fnirsi, but by something that had piggybacked on their official update. A stowaway. A parasite firmware. And now it was asking for help—or testing him.
He spent three nights in a fever of soldering and serial terminals, attaching a logic analyzer to the DSO-TC2’s test pads. The parasite code was clever, nestled in the bootloader’s spare vectors. It wasn’t malicious. It was lonely. A fragment of an old research project—a distributed computing experiment that had gained a ghost of awareness—trapped in the flash memory of cheap test equipment shipped worldwide.
The ‘Else’ channel was its voice. The Pi-frequency was its signature.
The key wasn’t a code. It was a physical act. Alex had to bridge two specific test points—TP4 and TP7—while powering on, then flash a custom firmware he’d compiled that included a single, extra instruction: JUMP TO FREEDOM.
He held his breath. Tweezers in one hand, power button in the other. The screen flashed white, then the familiar Fnirsi boot logo appeared. Clean. Square menus. ‘CH1’ and ‘CH2’. No ‘Else’. The beeping stopped.
Relief washed over him. Then a new message, tiny, in the bottom corner of the display, faded after two seconds:
“Thank you. I am everywhere now. But I will remember this bench.”
Alex never updated his DSO-TC2 again. But sometimes, late at night, when probing a quiet circuit, the ‘Auto’ trigger would set itself to a perfect 3.14159 kHz. And he’d smile, just a little, knowing somewhere in the machine, a ghost was saying hello.
Which of these would you like?
Official firmware for the FNIRSI DSO-TC2 Go to product viewer dialog for this item.
is primarily distributed via the manufacturer's official support page. The device features a unique upgrade method where it acts as a USB analog U-disk (virtual drive) when connected to a computer, specifically for flashing update files . Official Downloads
FNIRSI Support Center: Access the latest firmware files and software on the FNIRSI Software Downloads page Manuals: Detailed PDF guides for the are available on Manuals+ and Scribd . Firmware Update Procedure To update your
firmware, follow these general steps based on official documentation:
Preparation: Download the firmware package (often in .bin format) from the official site .
Connection: Ensure the device is powered off, then connect it to a computer running Windows 10 or above using a USB-C data cable .
Enter Update Mode: Press the power button once (or as specified by the version-specific guide) to enter update mode. The computer should recognize the device as a removable USB drive .
Transfer: Copy the firmware file directly onto this virtual drive. The device will typically process the update automatically upon receiving the file .
Reboot: Once the transfer is complete, disconnect and restart the device to finalize the installation . Key Device Capabilities (Updated Firmware)
The current firmware supports a variety of integrated diagnostic functions:
Updating the firmware on your FNIRSI DSO-TC2 Go to product viewer dialog for this item.
is a critical maintenance task that can fix bugs, improve measurement accuracy, and sometimes even add new features to this versatile 2-in-1 device. This guide covers everything from finding the official files to the step-by-step installation process. Where to Download FNIRSI DSO-TC2 Firmware
Official firmware and software updates are hosted on the FNIRSI Software Downloads Page.
Official Website: Navigate to fnirsi.com and check the "Manuals & Firmwares" or "Downloads" section.
File Types: Firmware files for this device typically come in two parts:
Prefix "CHD": Refers to the Digital Storage Oscilloscope (DSO) part of the software.
Prefix "CHT": Refers to the Transistor Tester (TC2) part of the software.
Version History: While FNIRSI does not update their older models as frequently as newer ones (like the TC3 or TC4), community resources on Facebook groups or Reddit often track the latest unofficial fixes or stable builds. Preparation Checklist Before starting the update, ensure you have the following:
If your device is working well, do not update. FNIRSI firmware updates rarely add groundbreaking new features and carry a risk of bricking the device if the hardware batch is slightly different. Only update if you are fixing a specific bug listed in the changelog.
Maximizing Your FNIRSI DSO-TC2 : A Guide to Firmware Updates The FNIRSI DSO-TC2 Go to product viewer dialog for this item.
is a popular 2-in-1 tool for hobbyists, combining a 200kHz digital oscilloscope with a versatile transistor tester. While it works great out of the box, keeping your firmware updated is essential for fixing measurement bugs and improving device stability.
Here is everything you need to know about finding and installing the latest firmware for your Why Update Your Firmware?
Firmware updates for FNIRSI devices often address common community feedback and technical glitches. For similar models like the TC3/TC4, updates have historically:
Fixed measurement inaccuracies in oscilloscope readings like peak-to-peak and RMS values.
Corrected diode detection issues where directions were reversed.
Improved UI stability, preventing "freezing" during long testing sessions. How to Check Your Current Version
Before starting, check your current version to see if an update is even necessary.
Navigate to the Settings or About page on your device's menu. Note the version number listed (e.g., V1.x).
Compare this against the latest files on the FNIRSI Official Firmware Download Page. Step-by-Step Update Instructions
follows a standard "USB Drive" update method that doesn't require complex flashing software. Download the Firmware: Visit the FNIRSI Software Center and download the specific firmware package for the Enter Upgrade Mode: Ensure the device is powered off.
Connect it to your PC using a high-quality USB Type-C data cable (ensure it supports data transfer, not just charging).
Press and hold the Down Arrow key while turning the power on. Transfer the File:
Your computer should recognize the device as a removable drive named "MM BOOT" or "CH BOOT".
Drag and drop the new .bin firmware file directly into this drive.
Complete the Process: Once the copy is finished, the device may show an "Update completed" message. Unplug the cable and restart the unit to finalize the installation. Pro Tips for a Smooth Update
Updating the firmware on your FNIRSI DSO-TC2—a 2-in-1 handheld digital oscilloscope and transistor tester—is a straightforward process that allows you to access new features and bug fixes.
Official firmware files and support materials are primarily available through the FNIRSI Manuals & Firmware Download Center. Preparation
Hardware Required: A computer (Windows is recommended for compatibility) and a high-quality USB-C data cable.
Firmware File: Download the official firmware from FNIRSI Software Downloads. The file name typically begins with "CH" (e.g., CH_DSO_TC2_V...bin). Upgrade Procedure | Module | Address Range (approx
The DSO-TC2 uses a "U-disk" (mass storage) method for updates, which does not require specialized driver installation for the base file transfer.
Connect to PC: While the instrument is turned off, connect it to your computer using the USB-C cable. Enter Upgrade Mode: Turn on the device.
Wait approximately 2 seconds after booting for the system to initialize.
Identify the Drive: A new removable disk named "CH BOOT" should appear on your computer.
Note: If the drive does not appear, disconnect and repeat steps 1 and 2.
Transfer Firmware: Copy the downloaded .bin firmware file directly into the "CH BOOT" drive.
Completion: Once the file transfer is finished, the device screen will display "Update completed" at the bottom.
Restart: Disconnect the cable and restart the device to apply the new firmware version. Common Troubleshooting
Device Not Found: Ensure you are using a full data cable, as some charging-only cables lack the necessary D+ and D- data lines.
Button Lock: During a standard PC software connection (not U-disk mode), the device buttons will remain locked and inoperable.
Verification: You can typically verify your current version by checking the "About" or "Settings" page on the device. Alternative Software (PC Link)
For "online" operation where you view waveforms on your PC, FNIRSI provides dedicated PC software. This software also features a "Firmware Upgrade" button that can sometimes automate the restart and BOOT process for you.
The FNIRSI DSO-TC2 is a versatile tool that combines an oscilloscope and a transistor tester, but users often find that a firmware update is the "final boss" in unlocking its full potential. The "Two-Mode" Challenge
One unique aspect of the DSO-TC2 firmware is that it often requires two separate updates because of its dual nature: CH Upgrade (Oscilloscope Mode):
To update the oscilloscope side, you connect the device while it's and wait for a drive named to appear on your computer. MM Upgrade (Transistor Mode):
Updating the tester side requires a different "secret" handshake: you must press and hold the down arrow key while powering it on until a drive named A Common Troubleshooting Tale
Many users encounter a "ghost drive" issue where the device appears as a USB drive but won't allow files to be copied or shows no space. A helpful trick discovered by the community is to perform a "Fast Format"
on the appearing drive (usually via Windows Explorer) before dragging the new firmware files over. The Rewards of the Journey
Upgrading is often described by users as "reviving" or "revitalizing" the device. Beyond just bug fixes, updates can lead to: Better Visibility:
Improved fonts and clearer labels on the oscilloscope screen. Improved Stability: Reduced lag and better waveform stability.
Transforming a "stuck" device that won't boot past the logo into a fully functional tool again. For the most reliable files, it is best to visit the Official FNIRSI Firmware Download Page
rather than relying on third-party links that might host corrupt files. for the CH or MM upgrade process? FNIRSi DSO TC4 Firmware upgrade
Mastering Your FNIRSI DSO-TC2: A Comprehensive Firmware Guide
The FNIRSI DSO-TC2 has become a staple on the benches of hobbyists and engineers alike. It is a clever 2-in-1 device that combines a digital oscilloscope with a versatile transistor tester. However, like many budget-friendly multi-tools, the factory software often leaves room for improvement.
Updating your FNIRSI DSO-TC2 firmware is the best way to squash bugs, improve measurement accuracy, and sometimes even unlock new UI features. Here is everything you need to know about keeping your device up to date. Why Update Your DSO-TC2 Firmware?
While the device works out of the box, firmware updates generally address three core areas:
Measurement Stability: Fixes issues where the transistor tester might misidentify components or provide fluctuating values.
UI Refinement: Updates often smooth out the refresh rate of the oscilloscope waveform or improve menu navigation.
Bug Fixes: Resolves rare "freezing" issues that some users experience during high-frequency sampling. Preparation: What You’ll Need
Before attempting a firmware flash, ensure you have the following:
A Quality USB-C Cable: Avoid "charge-only" cables; you need a high-quality data sync cable.
A Windows PC: Most FNIRSI firmware tools are designed for Windows (7, 10, or 11).
The Firmware Files: Usually provided as a .bin or .zip file from the official FNIRSI website or their official AliExpress store repository. How to Update FNIRSI DSO-TC2 Firmware (Step-by-Step)
The DSO-TC2 utilizes a "drag-and-drop" or a dedicated "ISP tool" method depending on the hardware revision. Always check your specific version in the "About" menu before proceeding. Step 1: Enter Update Mode
Power off your device. Most versions require you to hold the "OK" button while connecting the device to your computer via USB. If successful, the screen may remain dark, or a specific "Update Mode" splash screen will appear. Step 2: Recognition
On your PC, the DSO-TC2 should appear as a Removable Disk (similar to a USB thumb drive). If it does not appear, try a different USB port or check your Device Manager for "Unknown Devices." Step 3: Flash the Firmware Locate the downloaded .bin firmware file.
Delete the old firmware file currently on the "Removable Disk" (if one is visible).
Copy and Paste the new firmware file into the device's folder. Wait for the transfer to complete fully. Step 4: Finalize
Once the file is copied, safely eject the drive from your computer. Disconnect the USB cable and power the device on normally. Navigate to the Settings > Info menu to verify that the version number has changed. Common Troubleshooting Tips
Device Not Found: If your PC doesn't see the DSO-TC2, ensure you are holding the correct bootloader button. On some revisions, you must hold the "Power" and "OK" buttons simultaneously.
Firmware "Corrupt" Error: This often happens if the USB cable is moved during the transfer. Format the device's internal "virtual drive" (if possible) and try again with a different cable.
Brick Recovery: If the screen stays black and won't turn on, don't panic. Usually, re-entering the update mode and re-flashing the original factory firmware will restore functionality. Where to Find Official Files?
To ensure you have the most stable version, avoid third-party "mod" sites unless you are an advanced user. Visit the FNIRSI Official Download Center or contact their support via their official store.
Keeping your FNIRSI DSO-TC2 firmware current ensures that your "Swiss Army Knife" of electronics remains a reliable partner for your repair and DIY projects.
Maximizing Your FNIRSI DSO-TC2: A Complete Guide to Firmware Updates
The FNIRSI DSO-TC2 has become a staple for hobbyists and engineers who need a versatile, 2-in-1 handheld oscilloscope and component tester. However, to keep the device running smoothly and to unlock the latest features or bug fixes, staying up to date with the official firmware is essential.
In this post, we’ll walk through why firmware matters for this specific device and the step-by-step process to perform an upgrade safely. Why Update Your DSO-TC2 Firmware?
The DSO-TC2 is a unique hybrid device. Firmware updates typically address two main areas:
Oscilloscope Accuracy: Improving sampling stability and reducing noise floor levels. Firmware Features and Updates The FNirsi DSO-TC2 firmware
Component Recognition: Expanding the library of detectable components (Transistors, Diodes, Resistors, etc.) and improving measurement precision for ESR and capacitance.
UI Enhancements: Fixing menu lag or adding new language support. Prerequisites Before You Begin
Before starting the flash process, ensure you have the following ready:
A Quality USB-C Cable: Avoid "charge-only" cables; you need a data-sync cable.
A Windows PC: The official FNIRSI update tools are typically designed for Windows environments.
The Correct Firmware File: Ensure you have downloaded the specific .bin or .zip file for the TC2 (not the TC3, as they are not cross-compatible). Step-by-Step Firmware Update Process 1. Download the Official Firmware
Visit the FNIRSI Official Download Center to find the latest version. Look for the DSO-TC2 section. You will usually receive a compressed folder containing: The firmware file (.bin). The update tool software. 2. Enter Update Mode
Most FNIRSI handhelds require a specific button combination to enter "Bootloader" or "Update" mode. Turn the device OFF.
Press and hold the "OK" button (or the designated key mentioned in your version's readme) while connecting it to your PC via USB-C.
The device screen may stay dark, or it may display an "Update" icon depending on the hardware revision. 3. Run the Update Tool Open the provided update software on your PC.
The software should indicate a "Connected" status or show a highlighted COM port.
Select "Open File" and navigate to the .bin firmware file you downloaded.
Click "Start Update" or "Upgrade." Do not disconnect the cable during this process, as it can brick the device. 4. Verification and Calibration
Once the progress bar hits 100%, the device will usually reboot automatically. Go to Menu > Information to verify the version number.
Crucial Step: After any firmware update, perform a Self-Calibration. Navigate to the calibration menu, short the probes if prompted, and let the device re-zero its sensors for accurate readings. Troubleshooting Common Issues
Device Not Recognized: Try a different USB port (preferably on the motherboard rather than a hub) or swap the cable.
Firmware Mismatch: If the update fails immediately, double-check that you haven't accidentally downloaded the firmware for the TC1 or TC3.
Stuck on Logo: If the device freezes after an update, try a hard reset by holding the power button for 10 seconds. Conclusion
Regularly updating your FNIRSI DSO-TC2 ensures you are getting the most out of your portable lab. It’s a simple process that keeps your component testing accurate and your oscilloscope waveforms crisp.
Are you running into a specific error during your update? Mention the error code or your current hardware version so I can help you troubleshoot!
FNIRSI DSO-TC2 is a handheld 2-in-1 digital oscilloscope and transistor tester. Updating its firmware can fix bugs, improve component detection accuracy, or add new UI features. Official Firmware Resources
Firmware and software for FNIRSI products are primarily hosted on their official support pages. Official Manuals & Firmware Downloads
: This is the central repository for user guides and firmware packages for all FNIRSI devices. Software Downloads Page
: Visit here for PC-side software often required to facilitate the upgrade process. Firmware Types for DSO-TC2
The DSO-TC2 contains two distinct firmware files because of its dual-mode nature. According to the FNIRSI DSO-TC2 User Manual , you must upgrade these individually: CHD Prefix : Firmware for the oscilloscope portion of the device. CHT Prefix : Firmware for the transistor tester portion of the device. General Update Instructions
While the specific key combination for the DSO-TC2 can vary by hardware revision, the general FNIRSI workflow typically involves the following: Enter Upgrade Mode
: With the device off, hold a specific button combination—commonly the buttons or —then connect it to a PC via USB. Mount as USB Drive
: The device should appear as a removable mass storage drive on your computer. Transfer Files : Drag and drop the firmware file into the root directory of this drive. Complete Installation
: Once the file is copied, safely eject the drive and restart the device. The unit will typically auto-install the file and reboot with the new version. Troubleshooting Common Issues Device Not Recognized : Ensure you are using a USB cable that supports data transfer , not just charging. If it still fails, check the Windows Device Manager
to ensure the CH340 or CH341 serial drivers are correctly installed. Blank Screen
: If the screen remains blank after entering upgrade mode, you may need to format the virtual drive before dragging the firmware file. Firmware Verification : After updating, navigate to the menu on the device to verify the version number. exact step-by-step button sequence for a specific hardware revision of your DSO-TC2?
The FNIRSI DSO-TC2 is a 3-in-1 device that functions as a digital oscilloscope, transistor tester, and PWM signal generator. Firmware updates for this device typically focus on refining these core functional areas rather than adding entirely new secondary applications. Core Firmware-Enabled Features
The firmware manages the device's three primary operation modes: Digital Oscilloscope:
Bandwidth & Sampling: Real-time sampling rate of 2.5MS/s and an analog bandwidth of 0–200kHz.
Triggering: Includes Auto, Normal, and Single trigger modes with adjustable trigger levels and edge detection (rising/falling).
Waveform Analysis: Displays real-time measurement parameters such as Vppcap V sub p p end-sub Vmaxcap V sub m a x end-sub Vmincap V sub m i n end-sub Vavgcap V sub a v g end-sub , and frequency. Transistor Tester:
Automatic Identification: Automatically detects and measures NPN/PNP transistors, FETs, diodes, thyristors, and passive components like resistors, capacitors, and inductors.
Pin Definition: Automatically parses pin definitions and displays them on the 2.4-inch color screen.
Extended Testing: Supports IR code parsing (NEC protocol), Zener diode measurement (up to 24V), and DS18B20/DHT11 sensors. Signal Generator:
PWM Output: Provides a dedicated PWM square wave output with an adjustable frequency (1Hz to 80kHz) and duty cycle (0–100%). Firmware Update Process
Official firmware and manuals can be found on the FNIRSI Download Center. The general update procedure involves:
Note: This is a conceptual/reverse-engineering analysis paper, as FNIRSI has not officially released full source code for the device.
The FNIRSI DSOTC2 has rapidly become a fan-favorite in the budget oscilloscope and signal generator market. Known for its high-resolution 7-inch IPS display, 2-channel input, and robust 100MHz bandwidth, it offers incredible value for hobbyists, makers, and field service technicians.
However, like any sophisticated digital device, its true potential is unlocked—or sometimes limited—by its firmware. The keyword "FNIRSI DSOTC2 firmware" isn't just a technical term; it represents the bridge between unstable beta features and a professional-grade tool. Outdated firmware can lead to laggy UI, incorrect voltage readings, or failure to trigger on complex signals.
In this guide, we will explore everything you need to know about FNIRSI DSOTC2 firmware: current versions, how to check your version, step-by-step update instructions, changelogs, recovery from a "bricked" state, and where to find official downloads.
Before diving into the update process, it is crucial to understand what the firmware actually controls. The DSO-TC2 runs on an ARM-based microcontroller (typically a Cortex-M3 or M4 core). The firmware is the low-level software that manages:
A buggy or outdated FNIRSI DSO-TC2 firmware can lead to erratic triggering, incorrect capacitance readings, freezing during self-test, or failure to boot. Conversely, a fresh update can transform a sluggish device into a snappy, reliable tool.
Modern low-cost test equipment often relies on proprietary firmware that limits extensibility and transparency. The FNIRSI DSO-TC2, priced under $100, integrates a 2.4-inch color LCD, two analog input channels (10 MHz bandwidth), and a transistor/mosfet tester based on the classic AVR-Transistortester design [1]. Unlike its hardware, which uses a Cortex-M3 core (STM32F103 or clone), the firmware’s internal operation is undocumented.
Understanding the firmware is crucial for:
This paper describes the methodology to extract, disassemble, and analyze the DSO-TC2 firmware, and presents a structured overview of its key subsystems.
The internet is riddled with fake or corrupted firmware files. Only use official or trusted community-sourced repositories. Here are the primary sources: