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Downgrade OnePlus 9 and 9 Pro From Android 12 to Android 11

OnePlus recently rolled the Android 12 Developer Preview 2 update for the OnePlus 9 and 9 Pro devices globally which brings a new revamped UI, new notification style, privacy dashboard, and many more to the table. If you have installed the Android 12 Developer Preview 2 and want to downgrade back to Android 11, then this guide is for you.

As we all know, the Android 12 Developer Preview 2 may contain bugs that can make your device unstable to use as a daily driver. In this tutorial, we will guide you on how to roll back from Android 12 to Android 11 on OnePlus 9 and 9 Pro. This guide is easy to follow, all you need is a computer with a working USB cable to connect your device to the computer.

OnePlus 9 and 9 pro

Downgrade OnePlus 9 and 9 Pro from Android 12 to Android 11

First of all, download the appropriate firmware package for your device from the below link. Once that is done, proceed with the instructions steps that follow.

Pre-Requirements:

Download Rollback Package

  • Device: OnePlus 9 and 9 Pro
  • Download: Link

Now that you have downloaded the rollback package from the above section, just create a complete device backup before proceeding with the below-mentioned steps. This is because the installation steps require a wipe of the data. Once you have done so, here are is everything you need to be aware of regarding the downgrade of the OnePlus 9 and 9 Pro from Android 12 Beta to Android 11.

Downgrade Instructions

  1. First of all, Turn off your device.
  2. Now reboot your phone into bootloader mode by pressing and holding the VOLUME UP and POWER buttons simultaneously.
  3. Now connect your device to your PC using the USB cable.
  4. Open the extracted firmware folder to flash it using fastboot mode.
  5. Enter the below code to boot your device into fastbootd mode.
fastboot -w

3. Now flash the following files by entering the code

fastboot flash boot boot.img
fastboot flash cpucp cpucp.img
fastboot flash dtbo dtbo.img
fastboot flash modem modem.img
fastboot flash oplusstanvbk oplusstanvbk.img
fastboot flash oplus_sec oplus_sec.img
fastboot flash qweslicstore qweslicstore.img
fastboot flash shrm shrm.img
fastboot flash splash splash.img
fastboot flash vbmeta vbmeta.img
fastboot flash vbmeta_vendor vbmeta_vendor.img
fastboot flash vbmeta_system vbmeta_system.img
fastboot flash vendor_boot vendor_boot.img
fastboot flash vm-bootsys vm-bootsys.img

4. Now reboot into userspace fastboot, aka fastbootd. If you don’t do this, the remaining files cannot be flashed:

fastboot reboot fastboot

5. Flash the remaining files:

fastboot flash abl abl.img
fastboot flash aop aop.img
fastboot flash bluetooth bluetooth.img
fastboot flash devcfg devcfg.img
fastboot flash dsp dsp.img
fastboot flash featenabler featenabler.img
fastboot flash hyp hyp.img
fastboot flash imagefv imagefv.img
fastboot flash keymaster keymaster.img
fastboot flash multiimgoem multiimgoem.img
fastboot flash qupfw qupfw.img
fastboot flash tz tz.img
fastboot flash uefisecapp uefisecapp.img
fastboot flash xbl xbl.img
fastboot flash xbl_config xbl_config.img
fastboot flash product product.img
fastboot flash system system.img
fastboot flash system_ext system_ext.img
fastboot flash vendor vendor.img
fastboot flash odm odm.img

6. Now reboot your device into the system using the below fastboot command:

fastboot reboot

7. If everything worked your phone should now boot into OxygenOS.
The files will be flashed to your currently active boot slot. If any of them fail to flash, switch to the other slot and start over from the beginning. I wasn’t able to flash odm, product, system, system_ext, and vendor to slot a, and had to use slot b instead. To check the current slot:

fastboot getvar current-slot

To switch slots:

fastboot --set-active=a

or

fastboot --set-active=b

So this was all from this guide on how to downgrade or rollback from Android 12 Beta to Android 10 stable build on your OnePlus 9 and 9 Pro devices. The first boot after the rollback could up some time, this is completely normal. Since a device reset has been taken place as well, you might have to set it up from scratch. Rounding up, here are some iPhone Tips and TricksPC tips and tricks, and Android Tips and Tricks that deserve your attention too.

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