Hi.
I understood you are using the SD-method?
In that case if you, like me, have a windows-machine with SD-card reader you can just remove the SD card from the miner, put it into your computer and change the mac addres in uEnv.txt on the SD card with notepad++ or similar.
I used the same mac-adress as my miner had with original FW, but if you have several miners the main thing is that you give each miner a unique mac.
BR.
Steff
Thanks, it make sense.
I find this on Braiins OS installation page. I will try it soon... need to move JP4 again from controller ( need to unscrew fan plate )

Adjusting MAC Address
If you know the MAC address of your device, mount the SD card and adjust the MAC address. in uEnv.txt (most desktop Linux systems have automount capabilities once you reinsert the card into your reader). The uEnv.txt is environment for the bootloader and resides in the first (FAT) partition of the SD card. That way, once the device boots with Braiins OS, it would have the same IP address as it had with the factory firmware.