Well go through the 2nd step
Nd b4 going though tht step 1st do u hav a custom recovery installed???
If not pls do it
Nd press the volume up key as it'll take u to the recovery nd everything should be done by the system itslf so no need to worry of other things after tht process completed it'll either ask u to reboot r it'll reboot by itself just do the necessary
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RATHER THAN POSTING THANKS AS A REPLY IT'S BETTER TO PRESS THE THANKS BUTTON
"SAVES USELESS POSTS"