I have a problem with my FP2 running FP Open 19.08.1:
Running on a local shell
ip link set wlan0 down
ip link set wlan0 address 84:cf:bf:01:23:45
ip link set wlan0 up
ip link show wlan0
gives the correct new mac address (output of last command).
However, connecting with any wifi now gives “Authentication problem”.
Furthermore, switching wifi off and on resets the mac address.
The difference to change-mac-address-on-fp2/45098/4 is that I do have root access.