front camera doesnnt worrk

@friedsmoldena try safe mode first. If it works in safe mode you know you are having issues with some 3rd party Apps that prevents you from using you camera. You will have to uninstall those Apps.

If it still doesn't work in safe mode, you may just have a bad camera module. Replacing that should fix this.

This site shows you how to get into safe mode. Since iFixit does not yet have a guide for the specific camera use the guide from here It was written in Spanish so use a Browser that does the translation for you, if needed.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!