It seems that the adapter will accept only locally administered MAC addresses as valid (makes sense). This is signified by 7th leftmost bit set to 1, so MAC must start with 02. I changed it without any problems:
It seems that the adapter will accept only locally administered MAC addresses as valid (makes sense). This is signified by 7th leftmost bit set to 1, so MAC must start with 02. I changed it without any problems: