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Learn how to wipe the HTC One M9 using the hardware keys. If the phone is not working correctly, you may need to master reset it and also clear the cache partition. These two resets clear different parts of the phone storage. Unlike a master reset, wiping the cache partition does not delete your personal data.



Wipe cache partition

These steps will work as written for the T-Mobile supported version of this device. There may be variations if the customer has changed the default software.

  1. Be sure the phone is off.
  2. Press and hold the Volume Down key.
  3. Turn the phone on by pressing the Power key until the phone vibrates, then release Power.
  4. Continue holding the Volume Down key.
  5. Release the Volume Down key when the black screen with red and blue lines of text appears.
  6. Press the Volume Down key repeatedly until reboot to bootloader is highlighted.
  7. Press the Power key.
  8. The device will display a white screen with colored text.
  9. Press the Volume Down key repeatedly until BOOT TO RECOVERY MODE is highlighted.
  10. Press the Power key. The screen will flash HTC, wait for the next screen.
  11. Press Volume Down key to highlight wipe cache partition.
  12. Press the Power key.
  13. Press the Volume Down key to highlight Yes on the 'Wipe cache?' screen.
  14. Press the Power key.
  15. Once complete, press the Power key again to select Reboot system now.

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