Insert SD / Memory Card - HTC One® (M8) for Windows
This device supports microSD (TransFlash) memory cards. Memory cards can be purchased from any Verizon Wireless retail store or at the online store.
Ensure the device is powered off.
If applicable, press and hold the Power button then drag the window to the bottom of the display to power off. Once the "goodbye" message appears, allow up to 15 seconds for the device to completely power off.
From the right edge of the device (display facing up), remove the card tray.
Utilize the insertion/removal tool to unlock the tray by inserting it into the provided slot.
With the gold contacts facing down, insert the memory card into the tray.