Restore Backup
After a factory reset or when you switch to a new device, log in to your
Google account on the device and enable Account sync to restore the
data on the phone.
Factory reset
Note:
1. Restoring factory settings will wipe all app data, contacts, text
messages, and so on. Backup important data before a factory reset.
2. If "Erase internal storage" is enabled, ensure that all important files,
such as photos and documents in the phone and local backup, have
first been copied to another device.
Operating guidelines:
1. Settings > Additional settings > Back up and reset > Erase all data
(factory reset)
2. Tap ERASE ALL DATA
3. Enter passcode. (If passcode is enabled)