After an unsuccessful attempt to flash firmware has changed the mac address. After flashing the 1.2.11 image, everything works, but the mac address has been changed. Is it possible to change it to the correct one? How to return the correct mac-address?
The shown MAC address is clearly a default/empty entry and not the real HW MAC address. Start with factory reset and next reload of a suitable firmware using the emergency procedure via pressing the switch via the hole at the back.
Loading an emergency file through a button in the hole does not give anything. The MAC address does not change to the correct one.
The MAC adddress is not really important as it stays local. If everything still works then it is not a real problem, but very strange it is.