how to factory reset

A factory reset restores a device to its original settings by erasing all data, which can be done through the device's settings menu, remote services, or physical buttons.

Preparation. Back up all important data, charge your device, and ensure you have your account credentials and screen lock PIN, as these are required to reactivate the device after the reset.
Settings Menu Reset. For most devices, navigate to the Settings app, look for System, General Management, or Reset options, and select the factory reset or erase all data command.
Remote Reset. If you cannot access the device, you may be able to use remote services like Google's Find My Device or Samsung's SmartThings Find to wipe the data from a computer.
Manual Button Reset. If the device is locked or unresponsive, you can often perform a hard reset by turning the device off and using a specific combination of power and volume buttons to enter recovery mode.