How to root Galaxy Tab S7(+). (GUIDE)

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AnonVendetta

Senior Member
Apr 29, 2016
1,101
431
Portland, OR
@Markeee: would you mind saying how you managed to relock the bootloader? I'm unlocked but want to temp relock to test something. I can get into download mode but there is no option to relock.
 

AnonVendetta

Senior Member
Apr 29, 2016
1,101
431
Portland, OR
Yeah I don't know much about how to lock and unlock the bootloader but a quick google search seems to bring up some how to videos
I know how to unlock it just fine. It's relocking that I can't figure out. Every guide I've found says to boot into download mode and select an option to relock. But I see no such option in my download mode screen. Strangely enough, volume up brightens the screen and volume down dims it, but neither works to select a seemingly invisible relock option. I can also use power + volume up, but that only exits download mode.

A user in the Tab S7(+) subforum says they managed to relock via the "bootloader menu" but didn't go into detail. The only things I know of that could be that, would be download mode. There is another interesting screen you can get to, by connecting to PC via USB, initiating an ADB connection, then typing "adb shell reboot bootloader". But this screen doesn't have a relock option either. I'm not sure what the purpose of this screen is, since it doesn't require root etc to get to it. Although I've seen screens similar to it in other devices. And my OEM unlocking in developer options is toggled on but greyed out, yet i cant toggle it off to relock.

I just downgraded from Android 12 back to 11, I was a bit dissatisfied with 12. I'm not rooted and TWRP isn't installed, just pure stock ATM. But I'm apparently still unlocked and can't figure out how to relock.
 

AnonVendetta

Senior Member
Apr 29, 2016
1,101
431
Portland, OR
I had Secure Folder working perfectly on Android 11 a few months ago. This was the case even with unlocked bootloader, Magisk, TWRP, neutralized vbmeta, etc. I didnt even have to do anything special, I just signed in and it worked out of the box. I noticed others saying it wouldnt work after root etc, and tried it anyway, surprised to see that it worked.

But after upgrading to Android 12, it no longer worked under the same circumstances. It just gives a "couldnt create Secure Folder" error. So I downgraded back to Android 11 recently, only to find that SF doesnt work anymore and gives the same error I got on 12.

This was one of my reasons for downgrading, but not the only one. So I'm going to hack away and try to find a solution. In other places I've been reading, SF can be made to work even with root.
 
Anyone successfully updated to the new firmware T870XXU2CVCD with April 1 security patch without losing data?

I flashed BL, AP, and HOME_CSC in odin and the tablet auto-boot into recovery with two options: factory reset or try again.
In the log, there was an error: Unable to set property "ro.boottime.init.mount.cache".

It didn't boot into system, and I had to do factory reset to boot into system. Then I moved on to next step and flashed the magisk patched boot.img.tar in odin and had to factory reset again to root the tablet.
 
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NexusS4gFreak

Senior Member
Sep 13, 2011
1,336
91
Riverdale,GA
I have a T978U, stuck in kiosk mode on startup so only have bootloader and maybe fastboot to do anything. Went to try and factory reset from the bootloader but only has an option to wipe cache, not data or system. What's the best way for me to go about factory resetting and then rooting my Tablet?
 

Leroy_Sparks

Senior Member
Jun 12, 2018
97
25
After pulling my hair out for a few hours, I finally got rooted. I'm on the latest Android version for XAR (T870XXU2CVE5 ). Odin kept failing when trying to install either the patched boot image or entire AP, but I finally noticed something that led me to fix it - I would get the unlocked bootloader message on startup but in developers options the unlock bootloader option was missing. After full reinstall, factory reset and re-enabling DE (bootloader unlock then returned enabled) I was able to obtain root.

Since I haven't seen this latest a12 version mentioned (June 2022) in this thread, here's what I used:

Files from Frija
Magisk Canary
Odin 3.14.4
 
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After pulling my hair out for a few hours, I finally got rooted. I'm on the latest Android version for XAR (T870XXU2CVE5 ). Odin kept failing when trying to install either the patched boot image or entire AP, but I finally noticed something that led me to fix it - I would get the unlocked bootloader message on startup but in developers options the unlock bootloader option was missing. After full reinstall, factory reset and re-enabling DE (bootloader unlock then returned enabled) I was able to obtain root.

Since I haven't seen this latest a12 version mentioned (June 2022) in this thread, here's what I used:

Files from Frija
Magisk Canary
Odin 3.14.4
What do You mean Re-enable DE?
I'm in the same exact spot. Flashed last rom and i can't patch AP with magisk...
 

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  • 9
    Download the firmware, and extract "boot.img.lz4" from AP.
    Use 7-zip or something else to compress the boot file and choose TAR format.
    Use Magisk to patch the "boot.img.tar", and you will get "magisk_patched.tar" in /Download folder.
    Flash it as AP and wipe user data. (You should unlock the bootloader.)
    Then you have successfully rooted your device.



    How to download the firmware.
    Use Samfirm to search device model and CSC code.
    It seems that Sammobile has not released the firmware of the new Galaxy Tab S7 series.
    9
    The various mileage from people rooting in this forum offers super conflicting information, especially conflicting with the OP.

    Can somebody who knows what they're doing, please make an actual guide that is longer than 5 short lines of general info, with links to files and explaining why he picked what thing to do / downmload, and then also please explain:
    - what do you loose by rooting? knox? netflix widevine L1? dex? pen? bootloader unlocked (how)? anything else asked on here and here?
    - how do you update after rooting? (without re-flashing everything every time)

    There's another quick guide in this thread, but no replies and no explanation for why he did what, so again not an actual guide that inspires confidence.
    Knox is 100% tripped. Samsung Pass cannot use. Netflix widevine, Dex and Spen are not affected.

    Unlock Bootloader: turn on "OEM unlocking" in "Developer options"
    connect to the PC, reboot the tablet and hold both volume up and down. Then hold volume up to unlock it. (The method may be different now)

    Download the firmware from Frija and unzip it.
    Unzip the AP file, you will get "boot.img.lz4" and tar this file, get a tar file.
    Copy it to your phone and use magisk to patch it, get "magisk_patched.tar" in "/Download". Copy it to the PC.
    Whether your phone is rooted or not is not important.

    Boot into Download Mode, and use Odin flash AP, BL, CSC, (CP). Then use AP slot flash "magisk_patched.tar".
    Install magisk manager on your tablet.
    Done.

    When updating your tablet, you should reflash it, including the new patched file, but use the "HOME_CSC" file instead of "CSC" file.
    Data will not be lost.

    Why patch the boot file?
    When patching it, magisk is written into it. When you boot your tablet, magisk will run. Another way is to patch the recovery file. When boot into recovery, magisk will run.

    When updating, why flash "HOME_CSC"?
    Flash "HOME_CSC" you will keep all your data, if you flash "CSC", you will lose all your data. It is the easiest way to update it.

    Any way to fix the Knox?
    No.

    Frija: https://forum.xda-developers.com/t/tool-frija-samsung-firmware-downloader-checker.3910594/
    Odin: https://odindownloader.com
    Magisk: https://magiskmanager.com
    5
    I know this is a question that might be better suited for its own thread but I kinda think its a quick answer for you guys.

    What do you gain from root on this specific device? I haven't had to root a device in a few years since Android has gotten pretty dammed good for my use case, but what's there to be had from rooting a tablet?

    I'm looking forward to my Tab S7+ but if I can make it better with root then I'd love to do it.

    I have rooted my Tab S7+ what i gained is the ability to add a system wide ad block with adguard doh + firewall with the ability to use a vpn at the same time.

    Also bouncer now works seamlessly with a rooted device. I also use warden which blocks in app trackers and loggers from system apps and debloat easily from the device without using adb.

    I am able to use tasker to seamlessly adjust apps that are not optimized for tablets in landscape mode so that they work properly on my device.

    All of that is only possible with a rooted device and im discovering new tweaks every single day.
    3
    @Markeee: I figured out how to relock, after several hours of digging and trying different things. I'm posting a short tutorial in the Tab S7(+) bootloader unlock thread for anyone who is interested.

    Bootloader relock instructions
    3
    1) The firmware I've downloaded doesn't have a 'CP' to flash (I think that's just the modem?).
    2) Do I need that?
    3) It has AP, BL, CSC and HOME_CSC only. Is it because I have the wifi-only version?
    1) Correct
    2) No
    3) Yes