Due to the generic nature of the CH341A chip, the device is compatible with several robust open-source tools:
Windows automatically installs an old CH341SER.SYS driver that locks the device.
The CH341A itself has internal firmware. The 21019 software works best with CH341A chips that have EEPROM version 3.0.0 or higher. Most black PCBs (rev C) work perfectly. Avoid the transparent blue PCB (rev A) – it has a 5V logic level that kills 1.8V chips. neoprogrammer 21019 ch341a link
Why use this specific version over others?
| Software | Price | Chip Support | CH341A Stability | Best for... | | :--- | :--- | :--- | :--- | :--- | | NeoProgrammer 21019 | Free | 1,200+ | Excellent (USB retries)| BIOS modding, Mac unlock | | AsProgrammer 1.4 | Free | 400 | Poor (timeout errors) | Small EEPROMs only | | FlashROM (CLI) | Free | 800 | Good (Linux only) | Scripting | | CH341A v1.30 (stock) | Bloatware | 200 | Terrible (crashes often) | Nothing | Due to the generic nature of the CH341A
The 21019 link is specifically prized because it includes an updated CH341A.INI file that corrects timing delays for large (256Mbit+) chips.
Report: Analysis of the "Neoprogrammer 21019" CH341A Programmer The CH341A itself has internal firmware
Subject: Technical Overview and Usage Report of the Neoprogrammer CH341A Device Date: October 26, 2023 Device Model: Neoprogrammer 21019 (CH341A Based)
The CH341A is a USB interface chip made by WCH (Nanjing Qinheng Microelectronics). In the context of flashing, it acts as an SPI/I2C programmer.
| Pros | Cons | |------|------| | Free and regularly updated | Hardware (CH341A) is slow compared to FT232H or TL866 | | Supports hundreds of chips | No native 1.8V support (needs adapter board) | | Works with cheap CH341A from AliExpress/eBay | Interface not beginner-friendly (lots of manual chip selection) | | Includes advanced features (auto-detect, batch) | Occasional detection errors on generic SPI flashes | | Good community support (forums, YouTube) | Some anti-virus false-positives on .exe (open-source nature) |