Hi, I have a Lumia 640 from metropcs running wp8.1 update 2 out of the box. Suddenly, the default camera app, along with the Lumia camera app and selfie app and all others doesn't let me use the front camera. Whenever I switch from the main camera to the front it's just black and shows nothing. Tried numerous soft resets and even a couple hard resets and using the Lumia software recovery tool with no luck. I'm stuck with what to do. Main camera works perfect. Any advice anyone? Posted this in the help thread but thought, might as well post here too.