after the upgrade via OTA to version 4.4.2 kitkat galaxy s4 rear of the camera no longer works, or has worked better in a month 3 times. I state that I have performed a hard reset before and after upgrading. I tried to install (uninstall ĄThen) also third-party applications to see if it worked in this case but nulla.Ho tried to clear the cache but nothing. On the rare times that worked I noticed that opened handling the camera, but the screen remained black, if I tried to activate the front camera and it worked if I tried to reactivate the rear sometimes worked but all with a lag to be frightening. I do not think it is a hardware problem but software. The'm trying them all but I can not get it to work; another proof that I have done is to use the qrcode reader but nothing works even with quell'app.
I thank those who can give me a hand.
greetings to all