Guide

Downgrading on Stock ROM (OOS)

How to downgrade OxygenOS on the OnePlus Nord CE 3 5G (ziti) using the local install option — and the warnings around OOS 13.

Source: Android Authority

Warning

I) DO NOT downgrade to OxygenOS 13 after unlocking the bootloader. II) Before locking the bootloader, make sure the device is unrooted. III) Your internal storage will be wiped.

Steps

Turn on Developer options.

To enable Developer options: Settings → About device → Version → tap the version number 7–8 times. Enter your password/PIN/pattern if prompted.
Go to About device → tap on OxygenOS.
Tap the four dots at the top and select Local install, then select the downgrade file.
Tap Install.

Warning — Your phone will reboot and all your data will be erased.

Steps

Links