OnePlus 9 Pro - Factory Resetting the Device

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Reboot or force reboot
Most issues can be resolved by rebooting your
device in the following two ways:
1. When powered on, press power button and
volume up button simultaneously, and then
tap "Restart" to reboot the device.
2. When powered on, long press the power
button and volume up button for 10
seconds, the phone will shut down, and then
press the power button to turn on the device
again.
System updates
1. Enter Settings > System > System updates.
Then the system starts to check for updates.
2. Follow the instructions to download and
update.
* If your device is up to date, you will not see
the instructions.
Backup and Restore
Create a backup or recovery when needed.
Backup and restore by OnePlus
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