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Hi, so I recently changed my back shell of my iPhone and did it in a bit of a rush so messed up a few things… the flash no longer works and the switch on the side of the phone doesn’t work. Any ideas? The only thing I know I did wrong was the plastic part in the top left of the iPhone I damaged but I don’t know what that part is to order a new one! thanks

You may have damaged the Power Button/Flash Flex. Take a look at this guide to find it and do a thorough visual inspection of the flex, especially along the bends. Look for tears, even the slightest bit and replace as necessary.