OnePlus OxygenOS12 User Manual

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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 > System settings > Back up and reset > Reset
phone
2. Tap Reset phone
3. Enter passcode (If passcode is enabled)
4. Wait till the factory reset is complete

OnePlus OxygenOS12 Specifications

General

Brand	OnePlus
Model	OxygenOS12
Category	Cell Phone
Language	English