Android head unit - MTCD KD - Color inversion - impossible to revert

Hi dear all,

I just recieved a new android car 2din head unit, it's a MTCD version with the last firmware version 5.1.1 android+KD+04.05.2016 and I have an issue with the display.
I have an inverted colors on the display.
No way to return to real colors.
I have wiped all users settings in recovery mode.
I have tried via adb to set pm clean com.android.systemui with no success.

Can you please help me ?
Thanks

Artius

Color inversion - is it save Battery ?

Sorry for creating new thread
I want to ask that whether inverting color of display saves battery (found in setting - accessibility - Color inversion)
I use some apps heavily (e.g opera mini) which has white background...by toggling Color inversion it make background black and text white.
As OP3 uses amoled display so Color inversion saves battery or not?