[Samsung Galaxy Note 20 Ultra Guides, News, & Discu] Threx71:
Magisk+TWRP for Exynos ONLY

Hi, there are some tutorials out here on the forum but some are outdated, others have dead links and other mix some steps from exynos and snapdragon, so this is a guide on how I did it, My device is the International Exynos LTE Dual sim variant or SM-N985F-DS running android 11 (oneUI 3.1) patch from april 2021 with security patch from may 2021 but this has been tested on many exynos variants.

See DR.Ketan post: https://xdaforums.com/t/guide-how-to-root-n20-ultra-n986b-n9860.4147023/

I based my guide on @dr.ketan 's guide and some bits from the comments and references from that post, so all credit goes to him and the people he reference on his post.

First of all as dr.ketan said:

1.- BACK UP ALL OF YOUR DATA, copy your files to a PC, make backups on google and samsung clouds and any other cloud service backup you have (whatsapp for example) becuase in this process all data is wiped TWICE.​

2.- Prepare your PC: ​

I personally recommend using a laptop or a pc with an UPS (backup battery) just to be safe.

2.1 Create a folder fo the files and create 2 folders inside named OLD and NEW (this is merely to keep files organized since they CAN be confused (see next steps), unless said otherwise ALL files and folders go in the OLD folder.

2.2 Download ODIN [CHECK FILES BELOW]

2.3 Download YOUR phone stock firmware (you have several options for this, I personally use sammobile but here you have to google on your own. Remember to extract the contents and you should have 5 files.

NOTE(hehe): to get your exact model name you can check on Settings>About phone>Software information>Baseband version.

2.4 Download Magisk APK and ZIP [CHECK FILES BELOW]

2.5 Download Multidisabler ZIP [CHECK FILES BELOW]

2.6 Download TWRP recovery [CHECK FILES BELOW] and place it in the "NEW" folder you created on step 2.1

IMPORTANT: use only THIS recovery from THIS file, since it's modified for exynos and also to skip a step on the process.

3.- Prepare your Phone:​

3.1 Copy the AP file from your PC (the one from the stock firmware) and the magisk.apk file you downloaded, to your phone.

3.2 Install the magisk app (the apk file)

3.3 Open the magisk app and select the first option, there you will have an option to select a file, select the AP file you copied from your pc an tap continue (or start I dont remember)

3.4 Now you will have a "Masgisk_patched-*********.tar" file on your download folder on your phone, copy that file to your PC and place it in the "NEW" folder you created on step 2.1.

4.- Now we start the process of modifying the phone​

4.1 UNLOCK BOOTLOADER: on your phone go to SETTINGS>ABOUT PHONE>SOFTWARE INFORMATION and tap the "Build Number" repeatedly until you see "You are now a developer" (or something similar)

4.2 Go back to SETTINGS and now you will have at the bottom a new menu called "Developer options", enter and toggle on the OEM unlocking option, this will prompt some warnings and an assistant, follow the instructions and when you finish turn off your phone.

4.3 Press and hold the VOL+ and VOL- buttons at the same time and connect the phone to your PC WHILE HOLDING BOTH BUTTONS, this will prompt DOWNLOAD MODE on your phone and you will see 3 options, Press and hold the VOL+ button to unlock the bootloader, now your phone will reboot and wipe all of your data.

4.4 Confirm OEM Unlock is enabled: after the reboot you will get the initial setup process again (as if the phone were new) skip though all (because it will be wiped again) and repeat the process on step 4.1

Now the OEM unlock setting should be GRAYED OUT and with this your phone is ready to be modified

5.- Flashing custom binaries​

5.1 Turn off the phone and put it into DOWNLOAD MODE again (see step 4.3) but this time use the first option, that is, press the VOL+ button ONCE, this will enter DOWNLOAD mode and put the phone in flashing state.

5.2 Open ODIN on your PC as administrator

5.3 On the Options tab UNTICK the "Auto Reboot" option

5.4 Click on the AP button and locate the "Masgisk_patched-*********.tar" on the "NEW" folder.

5.5 Click Start, wait until you see PASS on the top left corner

5.6 Click on the AP button again and locate the "Exynos no vbmeta recovery.tar" file on the "NEW" folder.

5.7 Click Start, wait until you see PASS on the top left corner.

5.8 THIS STEP IS CRITICAL: disconnect your phone from your PC, now READ AHEAD before doing anything.

Here you will have to do a combination of button presses to boot into recovery. Once your phone is disconnected press and hold VOL- and POWER BUTTON (side key) for approximately 7 seconds, once the phone screen goes black immediately release the VOL- button and press the VOL+ button WHILE KEEP PRESSING THE POWER BUTTON. You will see 1 or 2 warning and a glimpse of the samsung logo, keep pressing the buttons until you see the TWRP (Team Win Recovery) splash screen, at this point you can release the buttons.

5.9 now in the recovery navigate to WIPE tab > FORMAT DATA > and type yes to continue (read instructions on screen). DO NOT RESTART. go back to the starting screen and then navigate to REBOOT > REBOOT TO RECOVERY.

5.10 Your phone will reboot into recovery on its own, no need to press any buttons.

5.11 Once inside the Recovery, connect the phone to your PC, after a few seconds the phone will connect normally as if it were in the OS, now copy this files to your phone from your PC:

Magisk.zip

Multidisabler-samsung-3.1.zip

5.12 Go to INSTALL tab on your phone and select the multidisabler zip and install it (it will prompt you to swipe to install), once finished tap on WIPE CACHE/DATA.

5.13 Now do the same with magisk.zip but this time DO NOT tap the "wipe cache/data" button, instead tap on REBOOT.

6.- First Boot​

NOTE: First boot takes a while but if your phone is not showing the initial setup screen in max 15 minutes something went wrong and you will have to flash back to stock firmware and start over.

6.1 Once you boot do the usual initial setup, here you can do it normally and restore your cloud backups.

6.2 When you are all set up, look for the MAGISK app, open it and follow the instructions. Your phone will reboot so make sure you are all set up BEFORE opening the app.

6.3 ALL DONE!​