I haven’t raised a bug for this.
I mentioned above that I would test a spare Matek F405-STD I had laying around. It has the same issue. I can’t get Yaapu to work with that either.
https://discuss.ardupilot.org/t/matek-f405-std-frsky-passthrough-telemetry-issues-4-0-3/59181
I was reading this thread regarding some issues people are having with the F405-STD and Yaapu. I’m wondering if the same issue exists with the H743? I haven’t taken the H743 apart but does anyone know if their are resistors to bridge on the H743.