Telemetry 2 port on ADSB board will not put full stream through. The artificial horizon and,compass information will not work on OSD. Telemetry 1 port works fine with exact same settings in PARAMs.
Edit: GPS2 port (serial 4) will not work either.
Edit again: Tried it on a standard carrier board with AP4.01 also and the same results. Tried the Beta AP4.02 beta 2 with the same results. I have a plane with 3.9.2 on standard carrier board that has no problem.
Edit again: Installed AP3.9.7 and all serial ports work fine. Problem is in AP 4.0.1 FW