Patch Stock Boot Image via Magisk and Flash it using Fastboot

In this guide, we will be providing detailed steps to patch a stock boot image file using Magisk and then to subsequently flash it via Fastboot commands. Thanks to the open-source nature of Android, there are a plethora of tweaks that you could try out. Once you have unlocked the device’s bootloader, the possibilities stand endless. From flashing custom ROMs such as Pixel Experience and AOSPs to replacing the stock recovery via TWRP, there is a lot to be achieved. Along the same lines, you could also root your device via Magisk.

Once rooted, you could then gain access to the system partition and carry out a plethora of tweaks. For example, you could install Substratum Themes, Xposed Frameworks, Magisk Modules. However, as far as rooting is concerned, it could be achieved via two different methods: via TWRP or without TWRP via the patched boot.img file. So before going on any further, let’s focus on the latter once it is going to be the crux of this article. [Update 1: Added a Fix for Android 11 Boot.img patch issues].


Flash pboot image via magisk and flash using fastboot

Why Root using Patched Boot.Img file

There exist two different methods to root any Android device. In the first one, you just have to flash the Magisk Installer ZIP file via TWRP and your device stands rooted. However, the next method calls for extracting the stock boot.img file from the stock firmware. Nowadays these stock ROMs themselves come in payload.bin or OZIP format. As a result, you will first have to decrypt this firmware packaged and then get hold of the stock boot.img. After this, you will have to patch this boot.img via Magisk.

This will in turn give you a patched boot.img file. Finally, you will have to flash this patched boot.img file Fastboot to gain root access. So all this begs for an important question- why choose this longer root method? Well, the thing there do exists many Android devices that don’t have a working TWRP build. And for them, this is the sole method to root their device.  So with that said, let’s now get on with the guide to Patch Stock Boot Image via Magisk and Flash it using Fastboot.



Patch Stock Boot Image via Magisk | Flash it via Fastboot

Before we list out the instructions, there are a few requirements and downloads that you need to check-mark. Make sure to go through them and then only proceed with the instructions. Droidwin and its members wouldn’t be held responsible in case of a thermonuclear war, your alarm doesn’t wake you up, or if anything happens to your device and data by performing the below steps.

Prerequisites

  • Make a complete backup of all your data. While creating a patched boot.img file or flashing it via Fastboot doesn’t wipe the data partition, but it is still advisable to be on the safer side and take a backup beforehand.
  • Next up, it goes without saying that you need to unlock the bootloader on your device. You may also refer to our guide on how to Unlock the Bootloader of Android Devices.
  • Also, download and install Android SDK Platform Tools on your PC. This will provide you with the necessary ADB and Fastboot binaries.
  • Finally, enable USB Debugging on your device. This will be needed so that your device gets recognized by the PC in ADB Mode. This ADB Mode will be used later on to boot your device to Fastboot Mode. Hence go to ‘Settings’ > ‘About Phone’ > Tap on the ‘Build Number’ 7 times > Go back to ‘Settings’ > ‘Developer Options’ > Toggle on the ‘USB Debugging’. [Don’t Miss: How to Enable USB Debugging on a Broken Android Device’s Screen? ]
    usb debugging oneplus

Downloads

Check for Ramdisk

You would only be able to proceed with the below steps if your device has Ramdisk. To check for the same, launch the Magisk App, and refer to the section under Magisk. if it says, YES (see below image), you are good to proceed ahead with the below steps. However, if it says NO under Ramdisk, then the below steps wouldn’t work. In that case, you will have to refer to our other guide: Install Magisk in Recovery and Root Android [No Ramdisk].

ramdisk check android

That’s it. You may now proceed with the steps to Patch the Stock Boot Image via Magisk and Flash it using Fastboot.

STEP 1: Get Stock Boot.img File from Stock ROM

payload bin extract via python oneplus 7 7T pro

To begin with, you will have to extract the stock boot.img file. And as opposed to earlier times, the process is a little bit more complicated nowadays. You cannot simply extract the firmware and get the required partition files (such as vbmeta.img, system.img, boot.img, etc). The reason is that many OEMs packs the ROM’s IMG files inside an encrypted package. For example, OnePlus has these files inside payload.bin, Realme, and Oppo have their files inside the OZIP format, and so on. In that case, you may refer to our below guides to get the stock boot.img file:

Now that you have got hold of the stock boot image file, it’s time to patch it via Magisk and flash it via Fastboot Commands. We have listed the steps for both the older as well as the newer build of Magisk Manager. As far as the difference between them goes, it’s just some UI tweaks here and there, the underlying functionality remains the same.


UPDATE 1: Quite a few Android 11 users are facing issues while patching the stock boot.img file via Magisk manager. Well, I have found the fix to this issue, please refer to our detailed guide on the same: Fix Magisk patched boot.img issue while Rooting Android 11. If you wish to save a click, then here’s the explanation in short:

You have to install the Magisk Canary build instead of the stable and then change the update channel to Canary from within the app itself. Once you have done the said change, you may then proceed with the below steps to patch the stock boot image file using Magisk and flash it via Fastboot commands.


STEP 2A- Patch the Stock Boot Image File using Older Magisk

  1. Download the stock firmware for your device.
  2. Extract the boot.img file from it.
  3. Transfer it to the device’s internal storage.
  4. Install the Magisk Manager App on your device.
  5. Open it. Tap on the first ‘Install‘ button, next to Magisk status.
  6. In the next menu, again chose ‘Install‘.
    Patch and flash boot image- magisk patch
  7. Now select ‘Select and Patch a File‘.
  8. Navigate to internal storage and select the stock boot.img file that you extracted earlier.
  9. Let Magisk do the patching process. When it’s done, copy this patched boot.img file, named as magisk_patched.img, from your device (will be present under Internal Storage > Downloads) to PC where you have installed the ADB and Fastboot Tools (inside the platform-tools folder).


STEP 2B: Patch Stock Boot Image File using Newer Magisk

  1. Launch the Magisk Manager app on your device.
  2. Then tap on the Install button situated next to Magisk.
  3. From the Method section, choose Select and Patch a file.
    The patched boot image file will be saved in Internal Storage > Downloads. The name of the file will be magisk_patched.img
  4. Browse to the extracted boot.img file and select it.
  5. Then tap on the Let’s Go option situated at the top right.
  6. Magisk will now load the boot.img file and will patch it accordingly. Once that is done, you would get the Download Complete message.
    new-magisk-patched-boot-image
  7. The patched boot image file will be saved in Internal Storage > Downloads. The name of the file will be magisk_patched.img

STEP 3- Install the Patched Boot Image using Fastboot

Now that you have created the patched boot image file via Magisk, it’s time to flash it via Fastboot Commands. Follow along

  1. Connect the device to the PC via USB Cable.
  2. Now transfer the patched boot file from your device to the platform-tools folder on your PC.
  3. Inside the same folder, right-click on an empty area while pressing the ‘Shift’ key.
  4. Select the option ‘Open PowerShell window here’.
    Patch and flsh boot image via magisk- Open PowerShell window here
  5. Or you could also head over to the platform-tools folder on your PC, type in CMD in the address bar, and hit Enter. This will launch the Command Prompt.
    command prompt
  6. Type in the below code to make sure the device is successfully connected (an alpha-numeric code suggests successful connection):
    adb devices
  7. Now type in the below code to boot your device to fastboot/bootloader mode:
    adb reboot bootloader
  8. Next, type the below code to flash the patched boot image file:
    fastboot flash boot magisk_patched.img
  9. For devices with A/B partition, you need to flash the patched boot file to both partitions. Type the below code for the same:
    fastboot flash boot_a magisk_patched.img
    
    fastboot flash boot_b magisk_patched.img
  10. Now you may Reboot the device by typing the below code:
    fastboot reboot

That’s it. You have successfully rooted your device. When the device reboots, you could open the Magisk Manager app and confirm that the installation is successful. With the device now rooted, try tweaking your device by editing the build.prop file, optimize the device’s battery by the Greenify app or manage your kernel via the Kernel Aduitor. There are countless other things you could do. Explore the endless possibilities. So this was the detailed guide on how to Patch Stock Boot Image and Flash it on Android Devices. If you face any error, do mention it in the comments section below. We will get back to you with a solution at the earliest.


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