Before you buy a new cell phone or new tablet, please try the following procedure to repair your device. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before factory reset. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media. With or without insurance, if your cell phone lost, damaged or stolen at least your invaluable data is backed up in a safe place. If you are about to sell your phone and you want to wipe your personal data, or if your phone affected with virus you have to do a hard reset. In some cases, you can delete the forgotten password or lock pattern from your device as well. All information is for devices with stock based ROMs. If you are using rooted device, always back up your EFS folder first, containing your IMEI info, etc.!
Resetting the HTC One Max hard resetPerforming a factory reset using hardware buttons. All data will be lost!
If you can’t turn HTC One max on or access settings, you can still perform a factory reset by using the hardware buttons on HTC One max.
Important: The Fast boot option in Settings > Power must not be selected.
Press and hold the VOLUME DOWN button, and then press and hold the POWER button.
Wait for the screen with the three Android images to appear, and then release the POWER and VOLUME DOWN buttons.
Press VOLUME DOWN to select FACTORY RESET, and then press the POWER button.
or from settings
Go to Settings, and then tap Backup & reset.
Tap Reset phone.
If you also want to delete media and other data on HTC One max, select Erase all data.
To delete media and other data on your storage card, tap Erase SD card.
HTC One Max Soft resetIf the display is off, press the POWER button to turn it back on. If you've set up a lock screen, you need to unlock it.
Press and hold the POWER button, and then tap Restart. When asked to confirm, tap Restart.
If HTC One max does not respond to touch or can't press the buttons, you can still restart it.
Press and hold the POWER and VOLUME UP buttons for at least 10 seconds. HTC One max then reboots.