How to factory reset android phone when locked through Recovery Mode. Initially, turn off the phone. Next, keep pressing Power + Volume Up (or Power + Volume Down for some brands) simultaneously till the recovery screen shows up. With the help of volume buttons, you get to move around and select "Wipe data/factory reset, " then with the power button, you confirm. This will remove all contents and reset the phone. Upon finishing, you can select "Reboot system now. " Keep in mind that this could trigger Google Factory Reset Protection, and you may be asked to use your Google account to unlock your device.