Unlike older Huawei dongles (E3531, E303), the E5573s-320 has aggressive power management. It doesn't stay in "Download Mode" for long. If you attempt to load usbloader.bin at the wrong millisecond of the boot cycle, the device times out and reboots into normal mode, rendering the flash attempt useless.
If you followed the steps but still see errors, here is the diagnostic checklist:
| Error Message / Symptom | Likely Cause | Solution |
| :--- | :--- | :--- |
| "No device found" | Driver conflict or wrong USB port | Uninstall all other modem drivers. Use USBDeview to remove old Huawei entries. |
| "Send data timeout" | Wrong usbloader.bin version | Verify the MD5 checksum of your file. Redownload from a trusted source (e.g., 4pda). |
| Tool freezes at 3% | Power loss during flash | Use a powered USB hub. The E5573s-320 draws peak current during loader injection. |
| Device shows "Unknown USB Device (Device Descriptor Request Failed)" | Corrupted NVRAM | You cannot fix this with usbloader.bin. You need a full bootloader unlock via JTAG or a hardware programmer. |
| Loader sends, but router stays dark | Battery voltage too low | Use a fully charged battery. Do not rely on USB power alone for the s-320. |
This guide focuses on the common USB injection method and recovery steps.
The usbloader.bin does work on the E5573s-320 if you have the exact file matching your device’s hardware and bootloader version. However, for most users, you will never need to touch it. Standard firmware updates via the web interface (192.168.8.1) or SD card are safer.
Only attempt a usbloader.bin recovery if: e5573s320 usbloaderbin work
If you are looking for a carrier unlock or IMEI repair, usbloader.bin is not the right method – those use AT commands or a different partition write (e.g., nvram).
Disclaimer: Modifying device firmware may void warranties and violate local laws. Proceed at your own risk.
usbloader.bin Huawei E5573s-320 is a specialized binary file that acts as a low-level bridge between a computer and the modem's hardware, primarily used for "unbricking" or unlocking devices locked to specific carriers. The Mechanism of usbloader.bin At its core, usbloader.bin
serves as a temporary bootloader. When the modem is put into a "forced download mode" (often through a hardware "boot pin" or "test point" method), it enters a state where it can only communicate via a basic serial port, often identified as Huawei Mobile Connect - DownLoad Port Initial Handshake : The file is sent via a utility like the Balong USB Downloader . Once transferred, it resides in the modem's RAM. System Initialization
: It initializes the modem's HiSilicon (Balong) chipset, enabling the device to accept high-level commands and larger firmware files (BIN or EXE) that it would normally reject due to security signatures or region locks. Signature Bypass usbloader.bin is essential for devices with Secure Boot (secuboot) Unlike older Huawei dongles (E3531, E303), the E5573s-320
enabled. It provides the necessary credentials or environment to bypass signature checks during a downgrade or cross-flashing procedure. Operational Role in Firmware Modification The use of usbloader.bin
is the critical first step in a multi-stage modification process: Hardware Trigger
: Shorting the "boot pin" to ground while powering on forces the modem to skip its normal startup and wait for a loader. Loading the Binary usbloader.bin
is pushed via USB. If successful, the device re-initializes and appears on the PC under a different COM port (e.g., PC UI Interface). Firmware Injection
: Once this "bridge" is active, technical users can flash modified firmware to change the numbers, or permanently the device to work with any network provider. Common Challenges Firmware Mismatch usbloader.bin The usbloader
files may not work with newer E5573s-320 firmware versions due to updated security keys. Driver Issues
: The process requires specific Huawei drivers. If the PC only sees a "Yellow Mark" in Device Manager, the loader cannot be sent. Bricking Risk
: Using a loader meant for a different sub-model (like the E5573 -322) on an E5573 -320 can lead to a permanent software brick. Are you currently trying to recover a bricked device , or are you looking to your modem for a different carrier? AI responses may include mistakes. Learn more
Before proceeding, understand the following:
This guide is for educational purposes. You are responsible for your own actions.
| Error | Fix |
|-------|-----|
| Failed to open port | Another app (HiSuite, Mobile Partner) is using the COM port. Kill them in Task Manager. |
| Timeout waiting for ACK | The router didn't enter download mode. Repeat step 2 (battery out/in timing). |
| Checksum mismatch | Your usbloader.bin is corrupted or wrong chipset. Redownload from a known source. |
| Device reboots immediately after loading | You need a different usbloader version (try v1 vs v2). |