Usb-firmware-tool-alcor-au6366-au6371 [work]

Always match the PCB revision (e.g., AU6366 A3 vs A4) – flashing mismatched firmware will permanently brick the chip.

| Error Message | Probable Cause | Solution | |---------------|----------------|----------| | "Device not found" | Tool doesn’t recognize the chip | Short specific pins on the EEPROM (e.g., SCL/SDA) to force recovery mode | | "Download FIRMWARE fail" | Wrong firmware revision | Extract original firmware from a working identical reader using same tool in "dump" mode | | "Bad block at 0x..." | EEPROM wear or damage | Replace the 24C02/24C04 serial EEPROM if external | | "Set VID/PID failed" | Write protection | Uncheck hardware write-protect jumper (if present) on PCB | Usb-firmware-tool-alcor-au6366-au6371