Einleitung
Werkzeuge
Ersatzteile
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Shutdown your phone
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Get out the rear case of your phone
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Unscrew all screws identified in red on the photo
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Remove all plastic pieces using your nails or a plastic tool
 
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Unstick careflly the 3 metal stickers (connectors) identified in white on the photo with a flat screwdriver. Be careful these stickers are breakable.
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Cut some thick papers or cardboard to the size of each sticker.
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Stick under each sticker a cut piece of paper / cardboard in order to make a thickness
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Put the stickers back to their initial location (they will not stick again but it not important).
 
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                            Abschluss
                          
                          To mount again your phone, follow the previous steps in the inversed order.