yes
What exactly is the red screen saying?
to switch between them flash the relevant files from the "optonal extras" section
no idea sorry, if you can it will be in the testing settings and to permanently save it you will need forscan / ucds
Yes, like richard brachwitz said, you need a UCDS or experimental forscan which i wouldn't recommend.
Unfortunately I just bought the OBDLinkEX adapter and the Forscan extended lifetime license, so I'd prefer to try it that way. It's really not supported that way at all?