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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