My rear camera is not working how to fix it

@skyflames check to see if it works in safe mode. Power off the phone, press and hold the Power button until the logo appears, then quickly release the Power button and press and hold the Volume Down button until it boots into Safe Mode. It should now show "Safe mode" in the corner. If your camera works in safe mode, you will know that you have a bad 3rd party App on your phone that blocks access to the camera. Delete any 3rd part App that has to do with the camera and try it again.

If the camera does not work in safe mode either, you most likely have a bad camera module and will have to replace it. Since iFixit does not yet have any specific guide for that use the one from here to get to the camera. Replacement camera modules are readily available at many online stores.

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!