The factory setting is 1. Press and hold the volume increase button, HOME button and power button at the same time when turning off the machine, and release it after the screen lights up to enter the recovery mode. 2. After entering the recovery mode, the English selection interface will appear. Select Erase Data/Restore Factory Settings Confirmation-then select the middle line Yes-Delete; ; Of course. 3. Select Erase Cache Partition to reconfirm. 4. Finally, select the first reb oot system and restart the phone now. Note: When doing the above operations, be sure to back up important data such as personal data, phone book and SMS, because these data will be cleared when unlocking.