asix_eepromtool

What?

Read and write onboard config EEPROM on USB ethernet adapters based on ASIX chips.

• AX88772
• AX88772A
• AX88772B
• AX88178
• AX88172
• AX8817X

Tested on AX88772B but should work on the rest. No driver support needed.

Why?

• Change VID/PID, MAC address, etc.

It's not changing?

• It's been confirmed that some chips ignore VID/PID bytes in the eeprom completely. This is likely because ASIX chips have an eFuse block to set VID/PID/MAC permanently and some manufacturers use it to make their products more tamper-resistant. If you change both instances of the VID/PID bytes in the eeprom and the chip is ignoring them then it's probably one of those.

How?

• install libusb-1.0-0-dev (or your distro's equivalent package)
• gcc asix_eepromtool.c -o asix_eepromtool -I/usr/include/libusb-1.0 -lusb-1.0
• sudo ./asix_eepromtool