Introduction
Use this guide to open the OP-Z and replace the back cover.
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            Unlock the four rubber feet by turning them 90° counterclockwise using your thumb or finger tip. 
 
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            When turning the OP-Z over again the bottom plate should come off by itself (thanks gravity). 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
2 comments
and uhm where to order the backplate? :/
Same question