Hi,
Unfortunately your image is not available at the link you posted.
I configured in my image and working different wifi channel and working WPA2 mode. I haven't modified more. The modem synced at a VDSL 50 (non-vectoring) port. I haven't tried it since it was switched to Vectoring now and we still operate the other original image easybox x904 at the connection at the moment with stable 97Mbit/s down / 28Mbit/s.... Problem is no good working VPN (openvpn is really slow in original image) and no working static routes which are nessesary for me meanwhile. We have two different networks with 2 DSL lines in one combined internal network. So I wanna use an virtual interface and static routes to achieve both networks at the LAN side...
I wann either use the modified EBx904 with Openwrt and working WireGuard or Openvpn or put another device behind the original EB904 which gives trouble with clients in the original WiFi network...
But to conclude this post, I think the best idea is to start from scratch somehow and flash the newest available image through TFTP method.
Is there is difference between coming from older Openwrt or original image?
I also think slowly this device should get official support from Openwrt to get a clean and clear installation order.
It seems to be the only nearly working device with an integrated internal DSL card and telephone support....
That is what unfortunately still sucks in the Openwrt world...
So please don't judge me to ask for clear instructions again....