Resetting the HTC One mini hard reset

Performing a factory reset using hardware buttons
If you can’t turn HTC One mini 4G LTE Android phone on

    1. Press and hold the VOLUME DOWN button, and then press and hold the POWER button.
    2. Wait for the screen with the three Android images to appear, and then release the POWER and VOLUME DOWN buttons.
    3. Press VOLUME DOWN to select FACTORY RESET, and then press the POWER button. All data will be lost!
htc one mini hard reset
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or from settings menu

Go to Settings, and then tap Backup & reset.
Tap Reset phone.
If you also want to delete media and other data on HTC One mini, select Erase all data.
Tap OK.

HTC One mini Soft reset

If HTC One mini does not respond when you touch the screen or press the buttons, you can still restart it.
Press and hold the POWER button for at least 10 seconds, and then release it. HTC One then restarts.

General advice: Before you buy a new cell phone or new tablet, please try the following procedure to repair your device in a software way. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before doing 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.! Please also note, that a hard reset operation will not unlock your mobile phone's SIM lock or network lock, but it will remove the unlock pattern, remove the user password or PIN password (NOT the SIM card's 4 digit PIN code). Also note that the firmware version will not be affected in any way, it will not be downgraded, it will remain the same you are using and if you have rooted your device, root privileges remain also unaffected.