camera not working

hi folks,

yesterday i disassembled my torch to tigthn up the screws for the slider.
everthing worked fine.
After rebooting i found out the cam was without funktion, the trigger button is disabled and the screen is black.
Everything else is working without any problem.
Reopend the torch to check the plug connections of the flatcables, all fine.
so whipe the device reinstall the firmware.
Since then the camera app is gone, i only can access it through pictures -> camera.

Any ideas?

Greets