"I ran into a similar problem trying to hook my arducopter build into a Feiyu Mini 3D 

You need to be running release 3.3 to get the extra support for channels 9-12.  That frees you up to use SBUS or any 12 channel rx.

If you don't have that, then…"

"Going back a few years now from when this happened but the firmware developer had released a patch that fixed this problem.  I've since moved on to a different flight controller though."

"oh my gosh - I completely failed to credit you for donating that board....yes that was your board that was used to do the demonstration of both the minimosd firmware, and the kvteam firmware.

I have half a dozen of them in varying states of…"

"I think it might have been the jumper scenario - I forget which condition is bad for plugging in 2 power sources.

I did a little more research and it looks like I'm going to need to buy some extra gear - an AVR ISP MKII to interface with the Atmega…"

"One of the primary reasons I chose to go down the Arducopter path was for Return to Launch.   There are so many ways a flight can go wrong, you could lose your orientation, get blown off course, have an OSD mishap - whatever, but it pays to have…"

"This platform's a s***ton of work, but oh my lord is it worth it :)

RTL sorted out, RX failsafes confirmed working. RTL initially set to 1m/s because I terrified I might lose it.  ALT hold and Loiter all checked out.

No more tuning - time to FLY…"