I just bought a second hand (barely used) Samsung Galaxy S3 GT-19300 and the front camera is not working. The camera app itself is now stuck on the front camera so as soon as I open it, it gives the error message and crashes but the rear camera works fine when I open Snapchat. I have tried clearing the cache and data of the camera, gallery and Snapchat apps and restarting several times to no avail. I also wiped the cache partition via turning the phone off and holding volume up, home & power. When I dial *#34971539# and tap "Phone/CAM FW Ver Check," it says: The "Phone to CAM FW Write (Rear)" button is greyed out and unclickable. I think this may be the cause of the issue because in this video both of the guy's Rear Camera versions are ZDFE02. The problem is I have no idea how to fix it, I have been googling for the past 40 minutes but no thread in the archive of the most obscure forum I can find has an answer for me: Any help is appreciated!