Flaperon/aileron mixing and the reverse problem

RC6_Function=24 (Flaperon 1)
RC7_Function=25 (Flaperon 2)

Need to reverse flaperon servo.
If I try to set RC6_REV=-1 and RC6_REV=-1 it’s look like a FLAPERON_OUTPUT changed from 1:UpUp to 4:DownDown. And we are have no changes to Flaperon/aileron mixing reverse.

What can I do?

Have you tried reversion the aileron or flap input channels?