1. To start, turn off the phone with the POWER button.
2. Next, you need to press and hold the POWER button and the Volume Down button button within a few seconds.
3. When you see the Android image, release the kept buttons.
4. Use the Volume Down(-) button to select the menu item Recovery, and press the POWER button to confirm.
5. Select in the menu wipe data / factory reset using the Volume Up(+)/Down(-) buttons to go through the menu items and press the POWER button for confirmation.
6. End the operation to select from the Yes - Delete All user Data from the menu and press the POWER button to confirm the operation.
7. Select from the menu reboot system now and press the POWER button to confirm the operation.
Hard Reset - advantages and disadvantages HTC One A9?
In simple words, Hard Reset means hard resetting the phone. As a result, the system automatically returns to the factory settings and the system is completely cleared. Contacts, correspondence, application, files, search queries, passwords - all of this is deleted from the device's memory.
Benefits of Hard Reset:
The ability to reset the phone to factory settings. Removal of viruses that interfere with the normal functioning of the device. Solving problems that have arisen due to the conflict of some applications and those remaining after they were removed from the phone.
Disadvantages of Hard Reset:
All your contacts, data and media files will be deleted. The need to have an up-to-date backup of your data, contacts, settings and media files. In rare cases, it is impossible to remove some viruses from Android, even after a hard reset.
What needs to be done before the Hard Reset operation.
So that after a hard reset the phone is not blocked by the FRP, make sure that you know the login / password to your google account. You can sign out of your google account before resetting. Then you do not need to enter the login password to your Google account and you can immediately use your device. If, after a factory reset, the phone is locked because you cannot log into your Google account, then you need to find instructions for bypassing the FRP lock for your phone model. You will need to contact the official service center to bypass the FRP protection on some new phone models.
After performing a hard reset, your device will be completely wiped clean. Everything that was in the memory of your device will be deleted.
What can be done to avoid losing important information?
If important information (contacts, sms, photos, videos) remains in the memory of your device, then there are the following options to save it:
Synchronize your phone with Google contacts, Google drive. Backup your data, contacts and media. Using the service programs for your phone model, you can transfer important data to your PC.