How To Guide [Magisk][US/CAN BL Unlock] Root for Galaxy S21 Series (B/N/0/U/U1/W)

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Max128

Senior Member
Apr 16, 2011
1,152
299
Canada
Well guys you have forgot the debloat (yes i know you can do it with a computer without root) but you can not modding the /system partition either.

I'm a little surprised why no one has talked about ad blocker like adaway? I love so much this.. Mainly in games, I have some free to play games that play online and without a ad blocker I would have advertising videos several times for at least 30 seconds each.. With it i can avoid all of this
 
rodrigofd

rodrigofd

Senior Member
Feb 19, 2009
356
163
38
Madrid, Spain
www.linkedin.com
Samsung Galaxy A51
Samsung Galaxy A51 5G
Max128 said:
Well guys you have forgot the debloat (yes i know you can do it with a computer without root) but you can not modding the /system partition either.

I'm a little surprised why no one has talked about ad blocker like adaway? I love so much this.. Mainly in games, I have some free to play games that play online and without a ad blocker I would have advertising videos several times for at least 30 seconds each.. With it i can avoid all of this
Click to expand...
Click to collapse

To be fair, most of the reasons to root (including those I listed on this thread) have almost-good-enough nonroot alternatives.
Regarding ad blocking, there are some interesting alternatives, like using ad blocking DNS servers, you can easily configure on your network settings, on your unrooted phone (e.g. https://adguard.com/es/adguard-dns/overview.html)
 
Y

Yescheb

Member
May 22, 2016
10
0
I rooted mainly because of adaway and viper4android.

Viper4andoid did not work for me. Has someone got it working? How did you install it?
 
R

ramkiller1

Senior Member
Sep 12, 2011
63
7
I'm having issues with getting boot.img . I downloaded the SM-G9980 CSC TGY, used 7zip found AP, used 7zip in that, in there i found boot.img.lz4 and vendor_boot.img.lz4. I tried both files for magisk and it didnt work. Even tried removing the extension .lz4 but still installation failed. What can I do?

Edi: Figured it out, trying to figure out how to get into fast boot mode
 
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R

ramkiller1

Senior Member
Sep 12, 2011
63
7
When I do this on the CHina variant. the OEM unlock is no where to be found after unlockin boot loader the first time

Edit: figured it out

REPLY
 
Last edited:
R

ramkiller1

Senior Member
Sep 12, 2011
63
7
So I used the AP file, pactched it, reused it with odin with the other files, now my phone is in a boot loop , shows some red text to the top. I tried wiping but still boot loop

Edit : did a full restore on odin
 
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R

ramkiller1

Senior Member
Sep 12, 2011
63
7
How do you do " Rename magisk_patched.img to boot.img and use 7zip to make flashable tar of your boot.img " or get into fastboot

Edit: Used Odin
 
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R

ramkiller1

Senior Member
Sep 12, 2011
63
7
So I have done both ways with my China Variant, both gives me a bootloop. Not sure what to do now.

edit: Think i figured out why!
 
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C

c2560242

Senior Member
May 9, 2013
125
38
I saw yesterday s21 and now I can't get rid of thinking about selling mi10 I bought about half year ago.
What can you tell me about safetynet and google pay? Can you confirm it works fine after rooting?
 
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  • 32
    afaneh92
    afaneh92
    Note: this guide copied from topjohnwu's. Original guide here

    US/Canada bootloader unlock thread:
    here

    Before Installing Magisk
    • Installing Magisk WILL trip KNOX
    • Unlocking bootloader for the first time will do a data wipe.
    Installation

    If you already have Magisk installed, it is strongly recommended to upgrade directly via Magisk Manager using the “Direct Install” method. The following tutorial is only for initial installation.

    Getting Started

    Before you start:
    • This tutorial assumes you understand how to use adb and fastboot
    • If you plan to also install custom kernels, install it after Magisk
    • Your device’s bootloader has to be unlocked

    Download and install the latest Magisk app. In the home screen, you should see:

    device_info.png


    The result of Ramdisk determines whether your device has ramdisk in the boot partition.

    Unlocking Bootloader

    Unlocking BL on modern Samsung devices have some caveats, so I figure this would be helpful.
    • Allow bootloader unlocking in Developer options → OEM unlocking
    • Reboot to download mode: power off your device and press the download mode key combo for your device (Vol Down + Vol Up) while connected to usb.
    • Long press volume up to unlock the bootloader. This will wipe your data and automatically reboot.

    If you think the bootloader is fully unlocked, it is actually not! Samsung introduced VaultKeeper, meaning the bootloader will still reject any unofficial partitions before VaultKeeper explicitly allows it.
    • Go through the initial setup. Skip through all the steps since data will be wiped again later when we are installing Magisk. Connect the device to Internet during the setup.
    • Enable developer options, and confirm that the OEM unlocking option exists and is grayed out. This means the VaultKeeper service has unleashed the bootloader.
    • Your bootloader now accepts unofficial images in download mode.

    Patching Boot Image

    If your device has boot ramdisk, you need a copy of the boot.img

    Instructions
    • Use either Frija or Samloader to download the latest firmware zip of your device directly from Samsung servers.
    • Unzip the boot.img from AP and copy the file to your device.
    • Press the Install button in the Magisk card
    • Choose “Select and Patch a File” in method, and select the stock boot image
    • Magisk Manager will patch the image to [Internal Storage]/Download/magisk_patched.img.
    • Copy the patched image to your PC
    • Flash the patched boot image to your device.
      For most devices, reboot into fastboot mode and flash with command:
      fastboot flash boot /path/to/magisk_patched.img or
      Rename magisk_patched.img to boot.img and use 7zip to make flashable tar of your boot.img
      Reboot to download mode. Open Odin on your PC, and flash boot_patched.tar as AP.
    • Reboot and voila!

    Patching AP

    Instructions
    • Use either Frija or Samloader to download the latest firmware zip of your device directly from Samsung servers.
    • Unzip the firmware and copy the AP tar file to your device. It is normally named as AP_[device_model_sw_ver].tar.md5
    • Press the Install button in the Magisk card
    • Choose “Select and Patch a File” in method, and select the AP tar file
    • Magisk Manager will patch the whole firmware file to [Internal Storage]/Download/magisk_patched.tar
    • Start the installation, and copy the patched tar file to your PC using ADB:
      adb pull /sdcard/Download/magisk_patched_[random_strings].tar
      DO NOT USE MTP as it is known to corrupt large files.
    • Reboot to download mode. Open Odin on your PC, and flash magisk_patched.tar as AP, together with BL, CP, and CSC (NOT HOME_CSC because we want to wipe data) from the original firmware.
    • Your device should reboot automatically once Odin finished flashing. Agree to do a factory reset if asked.
    • Install the Magisk app you’ve already downloaded and launch the app. It should show a dialog asking for additional setup.
    • Let the app do its job and automatically reboot the device. Voila!

    Custom Recovery​

    Installing using custom recoveries such as TWRP is only possible if your device has boot ramdisk.

    Instructions
    • Download the Magisk APK
    • Rename the .apk file extension to .zip, for example: Magisk-v2*.*.apk → Magisk-v2*.*.zip. If you have trouble renaming the file extension (like on Windows), use a file manager on Android or the one included in TWRP to rename the file.
    • Flash the zip just like any other ordinary flashable zip.
    • Reboot and check whether the Magisk app is installed. If it isn’t installed automatically, manually install the APK.

    Thanks
    @topjohnwu for magisk and guide, If you appreciate his effort, show some love and support :)

    Donations
    https://www.patreon.com/topjohnwu
    https://www.paypal.me/topjohnwu
    View
    6
    afaneh92
    afaneh92
    US/Canada devices has no oem unlock toggle!
    Unlock service here

    How to get OEM Unlock option back for Non US/Canada device?
    1. Open the Settings app. Tap on General Management → Date and time.
    2. Use the toggle button to disable Automatic date and time.
    3. Set date option will be enabled now. Tap on it, and set the date to about 10-20 days earlier.
    4. Enable developer options.
    4.a Go to your device Settings.
    4.b Select ‘About phone’ » tap seven times on ‘Build number’.
    └ This will enable Developer options under Settings.
    4.c Go back to Settings » scroll down to the bottom and you’ll see Developer options menu.
    5. Open developer options (in the Settings app itself), and find the option called ‘Auto update system‘. Use the toggle button to disable it.
    6. Now, go back to the main screen of Setting, and then tap on Software update.
    7. Disable the option ‘Download updates automatically‘.
    8. Tap on ‘Download updates manually‘ option, but it will give you an error because of the wrong date, so it’s fine.
    9. Restart the device.
    10. Go to Settings > Developer options. The OEM unlock option should be enabled now.
    View
    6
    Didgeridoohan
    Didgeridoohan
    The latest Magisk Canary release (21409) contains the fix needed for the S21 devices, yes (but being a Canary release there are of course other bugs).

    But, @afaneh92, since you're just copying @topjohnwu's installation instructions exactly, word for word, wouldn't it just have been easier to link to those instructions and let people know that Magisk Canary releases now can root the S21 Ultra (and maybe also warn people that the Canaries can be buggy)?
    View
    3
    afaneh92
    afaneh92
    Boomorrow said:
    Thanks, but that doesn't apply to the S21 :coffee:
    Click to expand...
    Click to collapse
    Use latest magisk canary, I have rooted my S21 Ultra.
    View
    3
    cjrivera04
    cjrivera04
    joancolmenares said:
    I assume this will trip Knox right?
    Click to expand...
    Click to collapse
    Read the very first bullet, lol
    View

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