FlightMode's channel doesn't picked up

Hello. I am trying to configure APM 2.8 and in FlightMode tab doesn’t see any picked channel (usually should be 5 as I understood)

but as I checked in Radio Calibration when I change switch state it reflects to 5ch

Does anybody know any solution (or maybe I just should use another firmware?)

UPD:
Some additional info (ask me please, if anything more is needed):
I connect receiver with APM via PPM
Also checked in param list and there is only flight modes. Looked for something like FLTMODE_CH

Good day, check in MP if i remember well the parameter about flight modes channel and check if its set CH5

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Have checked in param list and there is only flight modes. Looked for something like FLTMODE_CH

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You won’t find it because in that ancient version of Arducopter it’s hard coded to Chan 5.

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Wow. tried to move joystick when modes are different and as I see all work fine, but number after Current PWM doesn’t change. So there is no matter, but really confused me.

Thank you