[OnePlus 8 Pro  Guides, News, & Discussion] dlads:
hi there,

Ok so you were on 10 ? ahhh that's a shame, the first guide in the OP is for updating from 10 to 11 and retaining root lol.

Ok so you need to do either one of two of the guides, boot or flash a patched boot img.

the guides are under the word 3rd (third)

Here they are.

3rd

Rooting using fastboot commands

Method 1

Booting the patched image first

1. Obtain a patched boot img for your device variant preferably using payload dumper or download one of mine from the foot of this guide or if you've just performed the above guide you should already have a functional one, copy this file to your fastboot folder on your computer

**NOTE - Again the above suggested downloads are for the EU/ UK variant- if you have another model / firmware please use that instead, If you did not obtain the boot.img from a firmware and patch it yourself, you will need to patch it again in magisk manager, to avoid a bootloop

2. Reboot your phone to fastboot and connect to your computer.

3. Boot the magisk patched img

fastboot boot magisk_patched (or name of your patched boot img

4. Reboot your phone, your phone should now boot and you should now be rooted but we need to make this permanent.

5. Open magisk manager and click install/update, if you are missing the install/ update buttons, change magisk version to beta in magisk settings.

6. Select Direct install (recommended)

7. Allow magisk to permanently root your device then click reboot.

You should now remain rooted.

Method 2

Flashing to both slots

1. Obtain a patched boot img for your device variant or download one of mine from the foot of this guide or if you've just performed the above guide you should already have a functional one, copy this file to your fastboot folder on your computer

**NOTE - Again the above suggested downloads are for the EU/ UK variant- if you have another model / firmware please use that instead, if you did not obtain the boot.img from a firmware and patch it yourself, you will need to patch it again in magisk manager, to avoid a bootloop

2. Reboot your phone to fastboot and connect to your computer.

3. Booting your phone to fastboot mode.

Command: adb reboot bootloader

4. Open a command prompt on your computer and navigate to your ADB/fastboot folder.

5. Type the following.

fastboot flash boot_a magisk_patched

Press enter.

fastboot flash boot_b magisk_patched

Press enter

fastboot reboot

Press enter

6. Your phone should now boot, open magisk and check you're rooted.

However if you don't have a boot.img or don't know how to obtain it, simply do the first part of the guide.

1st

Extracting a boot.img using Payload dumper

Pre-requisites

A device with working version of magisk manager installed, for these guides the version used was canary, simply change the channel to canary then select install / update:

Version used: Magisk (Canary) version: 1469b82a (21101)

Windows computer / laptop

A full update downloaded firmware zip for your model

Payload dumper program

Usage

On your computer

1. Download and copy the PAYLOAD DUMPER folder to your desktop, there will be 2 files and 2 folders from here: https://mega.nz/folder/vU00FZDa#PIEfjl5w5wonyNAwHW3FBQ

2. Download the firmware of your choice and open it, extract the file called payload.bin to the folder within the payload folder called payload_input.

3. Run the program payload_dumper.exe (this will extract a bunch of files to the payload_output folder, allow it to completely finish (the CMD window will close automatically)

4. One of the files will be called boot.img copy this to your phone, root of storage.

On your phone

5. Open up Magisk and click Install / Update, if you don't see update then install the beta by changing the channel in magisk settings.

6. Select "Select and Patch a file" navigate to the boot.img and allow it to complete (this will output a file called "magisk_patched" (which will be in the Downloads folder)

You now have a patched boot.img ready to flash to either slot either via fastboot or via magisk

NOTE** Some people have noticed that an already patched boot.img when flashed can fail and cause a boot loop when flashed via fastboot so if you have downloaded a magisk_patched img from somewhere else then you WILL need to re-patch it on your own device preferably using the afore mentioned magisk manager.

If you intend to follow the guide below with your own patched img then you should'nt need to patch twice but it won't hurt.

Let me know if you get stuck.

If you don't have it you can obtain a firmware from oxygen updater, just open settings and turn on advanced, then re-download it.

Just don't skip any steps and make sure you reboot after removal of magisk modules.