Hi, I have a Spirit GTR 3.5.0 on my old Logo 20 using CCPM 90 swachplate . Everything is OK, except ailerons compensation direction, where Spirit GTR increase deviation on roll axis ! I try to reverse ailerons servo on transmiter, on Spirit receiver, every combination give wrong correction. Correction on elevator and rudder is OK. Is there a way to reverse compensation direction on one channel with GTR 3.5.0 ??

You will have cables incorrectly connected to the unit ch1 and ch3 ... swapped between them, that's one possibility.
It is also possible that the position of the unit in the model is entered incorrectly.
Another error may be in the Diagnostics tab, the green indicator of the ailerons does not move correctly according to the direction of deflection on the lever

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Spirit System (Spirit W1, RS & GTR & all the others)
Spirit Wave & JETI DS 12
http://www.habada.cz

You where right ! the diagnostic tab shows that my ailerons stick work in the wrong direction VS green indicator. I inverted P1 in function tab of my DC 16, and I have now the right compensation on all axis. Swatchplate try to stay horizontal whatever the movements of the logo.
Thanks for the help !