Originally Posted by Jason_Nguyen
My phone's screen goes black when I take a picture with flash and I can't do anything until I remove battery and reset.
This is a regularly known problem with the 4.2.1 camera. There are 2 ways to avoid this: 1. manually focus before you take the shot (must take the shot when the focus indicators light up). 2. Switch to action mode and you can autofocus, but you lose flash function.
I am sure devs are working very hard to fix this, but until then, these are your options. I hope I helped you out, if I did, please hit the little thanks button