Ender 5 pro z axis not moving

Hello everyone

I have a problem with the ender 5 pro.
When it trys to auto-home, the z axis is not moving anymore, also when I use the settings / move I cannot change the height of the print bed.
(BTW; This all happened after i connected the 3d contact sensor mixing up the 5V/neutral wire - so it could be possible that a short cuiruit could have caused the problem?)
My idea is to completely delete the OS and software from the mainboard and then set the printer up again by using a binary image.

Does anyone know how to do this or where i could find an image / binary that could be used? - Any help is greatly appreciated!

Nathan, student intern, slightly desparate