so my iphone is unlocked using tmobile. I loaded some apps with installer as well as rearranged my main app screen. I later discovered that perhaps I had accidentally may have erase an important file and now the photo and camera have a black question mark. Is there a way to load the oem camera and the photo function back? I am on a mac not a pc if that counts as some info about the platform I'm working on. I can reload the oem software but dont want to go there yet!