Regarding VFL's problem
Is it possible to connect the Azbox directly via LAN to the computer to do the update? Will need to enable dhcp, but will eliminate new router, right?
Maybe there is a port that is blocked in firewall or router?
Regarding USB, I for one have high hopes for it to work, I think DVB-T should have the highest chance of working since it has less bandwith. Good luck on the demux driver (maybe there is a way to demux two streams at the same time?)
Best regards!