Hello, @ajb
You can use the Bootutil to dump the NVM image, perform the modifications and then upload the image, but you would need to re-calculated the total checksum, and update the checksum value in word 0x3F by yourself.
Other option you can try is using the ethtool to alter the eeprom contents similar to how they make an MAC address change here: https://blog.kanbach.org/post/how-to-permanently-change-a-mac-address-using-ethtool/
Best regards,
Adolfo S
Intel Customer Support Engineer
