OnePlus OxygenOS12 - Accessibility Options; Magnification Gestures

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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