Panel button RGB lights don't light up - MTCD Android Head Units Q&A

I have bought a Isudar PX5 Android 8.0 unit with touch buttons below the screen.
The first time when I installed the device everythings was working fine including the touch button lights.
After I changed some settings in the factory settings menu (I disabled the TPMS app and changed the boot screen logo) the touch buttons light won't work anymore.
I have tried almost everything to solve this problem but without any results.
This is what I've done so far:
- Change settings in the factoy menu > Button light > By headlight, By Power, By power and headlight (nothing works).
- Connect the Illumni wire directly to the ACC power wire and checked the voltage.
- Switch the car headlight switch on/off.
- Reset the device to factory settings and reconnect al the wires.
I really hope that someone has a solution for this problem. I'm really thinking of a software issue because the lights were working in the beginning before I entered the factory settings.
Thanks for your help!

if the setting 'By Power' doesn't work then I would say it is a hardware failure. Only other thing I can think of is maybe you have the wrong panel light configuration set somehow - it has options for RGB etc

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