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I have Radiomaster TX16S bind with the Spektrum AR631 but cannot attach SAFE from the AR631 attach to a switch from the TX16S.

I followed the instructions and checks in this forum:
https://www.rcgroups.com/forums/show...nt-to-a-switch

I assigned switch SB to channel 5. Moved the sticks to the inner low corners and flipped the switch SB many times but that did not result in any reaction of the the flight control surfaces as an acknowledge of change.

Flashed 1.3.3.20 and reversed Ail and Ru direction. Switch did nothing also if I dont reverse.
Tried several different stick directions and suddenly IT WORKED.
Left stick left/up, right stick right/down