Just to follow up on channels 12 and 13 not being available to select in the UI I presume it's related to this discussion.
If so it looks like robimarko's recent commit will go some way to fixing that:
https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=7475321f46b83cc04296638d6cf31542d11e3e78
@Flole are you happy for me to try and get the board files upstreamed into openwrt/firmware_qca-wireless so they can have the updated regDb applied?