Einleitung
Don't panic if the back or recent tabs button stops working; just follow this relatively simple guide to replace them. You will need to remove the screen.
Werkzeuge
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            Locate the indent area highlighted in red and use either your fingernail or a Prying Tool (such as a guitar pick) to separate the back from the body of the phone. 
 
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            Once the cover is removed, locate the battery that reads "SAMSUNG." 
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            Use either your fingernail or a Plastic Prying Tool (such as a guitar pick) to lift up the bottom indent of the battery. 
 
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            Use a Thin Plastic Tool (such as a guitar pick) or Plastic Prying Tool (such as a spudger) to lift out the glass digitizer and LCD screen around the edges. 
 
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                            Abschluss
                          
                          To reassemble your device, follow these instructions in reverse order.