According to BGR， recently with the user on the Apple official BBS, said their iPhone 7 Plus rear dual cameras in the normal case appeared unable to work, even if restart.
Apple so far have no response to this matter, so is the firmware or mobile hardware system out of the question is not clear.
Problems of user, open the iPhone 7 Plus camera App, framing interface is dark, the user can’t normal. Even forcibly taken out of the picture is purple or green. Also has the user mentioned, appear this kind of situation when the iPhone 7 Plus screen shows emergency, the iPhone needs to cool, even if the iPhone’s temperature is not high.