When i put heli upside down than heli start rolling back to normal position, can`t hold heli in inverted position where can be the problem?
you might have the trainer mode on. Check this parameter
ACRO_TRAINER
Set it to zero to disable this feature. I believe it is defaulted to 2 which is the behavior you described.
Huh yes, it is set to 2, will try with 0, Thank You