Support for new Archer c50 v3.0

Hey,

I'm quite new to LEDE/OpenWRT etc. I managed to etablish Heiz' Version to my Archer C50 v3.

My 5G-Wifi is working fine (better than it used to with original firmware). However, my 2.4-Wifi does not work correctly. It doesn't send any signal, if I choose Auto Channel. Even after choosing a Channel, I cannot manage to establish a connection to the router.

Can anyone help me out?

Thanks!