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Saved me already this has, just unlocked my iPhone 7 to use the camera and the camera just wouldn’t focus and I wasn’t able to see anything on the screen of what I wanted to take a photo of.
The yellow square for focusing kept moving around the screen, so I decided to use this to restore etc and it worked a treat :) Happy days.
Just really hope the problem doesn’t happen again, just don’t want the hassle to take it/send in for repair etc.
 
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