Some times you could accidently loss your data or error is coming up to your Android Phone. The thing you should do if this happen is to recover your lost data.
It can be easily brought to the service center and they will have it done for you. But if you decide to do it your self, It is quite easy just follow this simple steps.
First, Shut it down
Second, Turn it on into a bootloader/fastboot mode by Press and hold Volume key and the power key all together until the bootloader screen shows.
Third, find the recovery option and press recovery to boot into clockwork recovery.
Fourth, Smile cause you’re done.