In this guide

Open Back up & reset
Check your backup, then tap Reset phone
Tap Erase all data
Tap Clear
If you do not see this option
If this does not work
Good to know
Sources

Short answer

Back up first. Go to Settings, System & update, Back up & reset, Reset phone, and tap Erase all data. A box asks Permanently clear all data? Tap Clear and follow the prompts. The phone is restored to factory settings.

Device: Android
Shown on: OnePlus Nord 5 (CPH2709), OxygenOS 16.0.5.1201, Android 16
App: Settings
Path: Settings › System & update › Back up & reset › Reset phone › Erase all data
Real screenshots: 4 of 4 steps
Checked: October 2026
Sources: 4 official, linked below

Step by step

Open Back up & reset
Open Settings, System & update, and tap Back up & reset.
Done
Check your backup, then tap Reset phone
Google backup said Add a backup account now on ours, so nothing was backed up. Back up & migrate is at the top.
Done
Tap Erase all data
It is the last of the three; its line reads Reset to factory settings. Reset all settings above it only resets settings, including network settings.
Done
Tap Clear
The box says Permanently clear all data? Your phone will be restored to factory settings. We tapped Cancel.
Done

If you do not see this option

OxygenOS 14 (OnePlus manual)? The manual's path is Settings, Additional settings, Back up and reset, Reset phone, and you enter your lock screen password. Source: OxygenOS 14.0 User Manual
Can't open Settings? Erase the phone from Find Hub on another device. Source: Find, secure or erase a lost Android device

If this does not work

Asked for your Google account after? Sign in with the account that was on the phone. This is Google's theft protection. Source: Reset your Android device to factory settings
Photos gone? Only what was backed up comes back. Source: Back up or restore data on your Android device

About this guide

A factory reset deletes your apps, photos, accounts and settings. Do it before selling the phone or as a last fix.

The screenshots are from our OnePlus Nord 5 with OxygenOS 16.0.5.1201 and Android 16, in Dark mode. We only opened the first box and tapped Cancel straight away, so we did not see the steps after Clear.