AP with WiFi-Dongle

[e-sailing]

I'm confused. You posted that status said up network wlan1  -> so rules have worked.
Now you say rules didn't work (wlan0)???

Your correction in rules isn't wrong when it now works.

I don't think that you have to go back to V1.1 the problem with rules you already solved.
But you can try.
rename openplotter folder to openplotterv12 
cd ~/.config
git clone https://github.com/sailoog/openplotter.git -b beta
cd openplotter
git reset --hard cb3e7e9d9c698df8bbfc4899070c2cf27644ee0b
restart



I had the same hard lockup as you and I think it has to do with the kernel. Search for raspberry kernel downgrade (choose the last 4.14).
make a backup before you do anything