Introduction
Use this guide to replace the microSD card on your HTC One M9.
Tools
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            The microSD card tray is located on the upper right hand side of the phone, above the volume buttons. To open the tray, insert a microSD card eject tool, or a paperclip, into the small hole in the microSD card tray. 
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            Then press the tool or paperclip to eject the microSD card tray. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.