2x LG G3 with CM12 same mac address. Wifi issue. Original MAC?? topic

I have 2x LG G3 d851

both have since i have installed CM12 the same MAC Address: 00:90:4C:C5:12:38 thats why i have Wifi issues on the same network.


i tried to change the mac address but after a reboot both devices get the same mac address again.

Is there a permanent way to change?
I dont know either whats the original address was?

Is it a known bug?

Thanks
Indian