How to Use the CH341A USB Programmer (Beginner-Friendly Guide)
What Is the CH341A USB Programmer?
The CH341A is a compact USB-based device used for reading, writing, verifying, and erasing firmware stored in EEPROM or SPI flash memory chips. Common uses include:
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PC motherboard BIOS flashing
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Laptop BIOS recovery (after a failed update)
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Router/modem firmware dumps
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Smart TV BIOS flashing
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EEPROM data backup (24xx/25xx series chips)
It is widely available in two versions:
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Black Edition – 3.3V default (can damage 1.8V chips without an adapter)
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Green Edition – 5V/3.3V switchable
Step 1: Identify Your BIOS/EEPROM Chip
Before connecting anything, locate the flash chip on your device’s motherboard.
Typical chips include:
Winbond (W25Q64, W25Q128, etc.)
MXIC (MX25L series)
Atmel / Microchip
Gigadevice
The chip will usually have 8 pins and be labeled with a part number.
Once identified, note the chip’s voltage requirement:
3.3V chips → direct connection
1.8V chips → MUST use a 1.8V adapter (to avoid burning the chip)
