I didn’t understood what you did with
openvpnandburp
openvpn - because i couldnt get this traffic to use simple proxy
burp suite - because I wanted to decrypt this traffic(thats why I had to install CA certificate from burp suite on my FP4)
I think dns server with “factory.fairphone.com” pointing to 127.0.0.1 could work too.
I will continue in new thread: Unlocking bootloader offline