Back up any important data
Charge the phone to at least 50%
Open Settings
Tap System
Tap Reset options
Tap Erase all data factory reset
Tap Reset phone
Enter your PIN, password, or pattern if prompted
Tap Erase everything
Wait for the phone to restart and complete the reset
If the phone is unresponsive, power it off
Press and hold the Power button and Volume Down button
Use the volume buttons to select Recovery mode
Press the Power button to confirm
When the Android logo appears, press and hold Power and tap Volume Up once
Use the volume buttons to select Wipe data/factory reset
Press the Power button to confirm
Select Factory data reset
Confirm the reset
Select Reboot system now
Wait for the phone to restart and finish setup