Introduction
If your keys aren’t working, then use this guide to help you replace the keyboard.
Tools
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            Hold the switch on the left and pull the battery up towards you, using the marked tab, to take it out. 
 
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            Locate the plastic bar at the top of the keyboard. 
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            Wedge a plastic opening tool under the bar and pop the bar out. 
 
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            Lift the keyboard to get to the plastic ribbon underneath. 
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            Using the Spudger, press a small tab on the left side of the ribbon. Then pull the ribbon out from the casing. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.