Omnibus F3 AIO + iNav... AETR5678 instead of AETR1234 channels?

Do you have anything else on UART3? If so that is probably the problem as PPM requires use of UART3
If not, check the 0R links to the left of the PPM Pin, maybe your board was not set correctly at the factory
If not already done so, have a look a this sites guide for this FC

I’ll try to find time tomorrow to power up my board in PPM and see if I get the same problems

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