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[ROOT][TWRP]Samsung Galaxy Tab A SM-T550/T555/P550/P555/T350/P350/T355/P355

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thanks... but cant get to work.
Last post refers an img file, also try that one... convert it to tar.md5 but get a FAIL on odin, tablet refers file is to big. :(

A TWRP.img file you have to flash via fastboot. When your tablet is in fastboot mode and connected to your computer, type: fastboot devices --> enter. You'll see wether your device is connected or not. If yes type "fastboot flash recovery twrp_3.3.1-0_gt510lte.img" (without quotes and however the TWRP.img file is named) Hit enter. now reboot immediately into TWRP-recovery. Done.
 
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jack4602

New member
Jan 18, 2021
2
0
I have an odd issue. After rooting my 550 was inverted by touch only on the Y axis. The screens look proper but to activate I have to tap the opposing side of the screen. I went ahead and loaded Lineage hoping that would resolve things but no luck. I reverted back to the recovery file and still no luck.

Any ideas?
 

jack4602

New member
Jan 18, 2021
2
0
Do you have the T550 or the P550 (spen)?
It is the P550. If it matters it is the Canadian version. I am downloading the entire 1.5GB firmware from Sammobile to see if I can get it back to original and have a plan if things go bad again.

Update:
Install of full firmware went OK. Was in a boot loop but deleting cache and data solved that.
 
Last edited:

retiredtab

Senior Member
Nov 16, 2017
824
393
1. What root program were you using?

The P550 is the s-pen version. In order for s-pen to work, it needs to load a specific driver called WACOM and it needs a specific set of kernel parameters, which I have yet to discover, in order for the screen and s-pen to work.

If the root program messed around with one of the kernel parameters or removed the WACOM driver, then the x-axis will be reversed.

2. What LineageOS version did you load? Was it one of my 16.0 or 17.1 roms (see below)?

3. The x-axis inversion is explained in more detail including how I fixed it is at

 

wjwjw

Member
Sep 24, 2020
5
1
First, thanks to all you XDA contributors! You've helped me breathe new life (and security updates) into older tablets for various family members. It's great to help them get a little more value out of their purchase.

I'm still very much a beginner and have gotten stuck with this T350. I've tried to stitch together various suggestions and instructions across threads, countering errors along the way - expect I did something incorrectly. Before I grasp at more threads and potentially do more damage, would appreciate informed guidance on next steps.

Thanks!

Here's what I've done:
  • device was running 7.1.1 Nougat before starting
  • successfully flashed TWRP (3.1.0-0) to recovery (file: twrp_3.1.0-1_sm-t350_18317.tar) via ODIN (3.14.1). Attempted to initially use TWRP 3.3.1 linked, but ODIN failed. Never experienced the blank screen (backlight) issue others reported. Honestly don't know if that applies to this T350.
  • successfully installed no-verity-opt-encrypt-6.1 and Magisk-v20.4 via TWRP
  • in preparation for installing a new ROM (which failed), did a wipe to include the System partition plus the cache options. although i didn't care about the data, i didn't backup any partitions. :(

Here's where I am:
  • every attempt to power-off results in a reboot. tell TWRP to Power Off...reboot. power button and/or key combos...reboot.
  • each device restart stops at the Samsung Galaxy Tab A splash screen. Top of the screen states in yellow text "Set warranty bit: kernel".
  • can still get into recover modes with the different button combos.
    • can access (ODIN Mode) screen via pwr-down-home buttons. and can connect with the ODIN client. The screen does tell me Current Binary: Custom; System Status: Custom.
    • can still access TWRP via pwr-up-home buttons.
  • TWRP and other prompts tell me "No OS installed!"
  • attempting to install various ROMs is unsuccessful
    • CRdroid - TWRP gives E3004 error because the device model cannot be detected properly.
    • Stock ROM (T350XXU1BPI1..) - TWRP gives error "Invalid zip file format".

At this point I don't know if this is a TWRP issue or some other self-imposed issue that is easy (or difficult) to fix. Again, appreciate guidance from those far more experienced on where to spend my time next.
 

wjwjw

Member
Sep 24, 2020
5
1
I don't think you can flash the stock ROM with TWRP. Did you try with Odin?

Thanks for catching that. Successfully flashed back to stock with Odin.

Holding Volume Down+Power while it's connected to power should turn the device off. Did you try that? Otherwise it simply forces a reboot.

It just wouldn't power off even with power supplied. But flashing back to stock ROM eliminated the issue.
----
So I restarted the process...now with Marshmallow 6.0.1
Confirmed via DevCheck my T350 does NOT have BOE panel.
Via Odin, I can only successfully install TWRP 3.1.0-0 (which gives those E3004 errors not detecting device model when trying to install any custom ROM - and fails).
I cannot install the recommended TWRP 3.3.1-0 - Odin fails. A later version of TWRP is presumably needed to install the custom ROMs.

Other thoughts? Is there another approach I should consider? Another TWRP version to try?

Thanks!
 

lpedia

Senior Member
Sep 18, 2020
157
76
Samsung Galaxy Tab S2
HTC 10
...
Via Odin, I can only successfully install TWRP 3.1.0-0 (which gives those E3004 errors not detecting device model when trying to install any custom ROM - and fails).
I cannot install the recommended TWRP 3.3.1-0 - Odin fails. A later version of TWRP is presumably needed to install the custom ROMs.

Other thoughts? Is there another approach I should consider? Another TWRP version to try?

Thanks!
Have you tried updating to the recommended TWRP 3.3.1-0 with TWRP rather than with Odin? You'll need to unpack recovery.img from the tar file and flash that via TWRP > Install > Install Image.

If you still can't flash CRdroid, try the [UNOFFICIAL][ROM] LineageOS 17.1 for Galaxy Tab A 8.0 [SM-T350] instead.
 

retiredtab

Senior Member
Nov 16, 2017
824
393
Here's the problem in a nutshell.

The TWRP 3.3.1 that is required to install the 17.1 custom rom is supplied in .img format. Earlier versions of TWRP can be used to install the 17.1 custom roms by removing the assert statements in the zip file. However, the assert statements are there to protect the user from accidentally flashing the rom on the wrong tablet.

I strongly recommend TWRP 3.3.1 as it's what I use and test with.

You have the following options to get the TWRP 3.3.1 .img installed.

1) Odin requires it in .tar or .tar.md5 format. There is a xda utility at


that converts img to tar.md5 format for odin flashing. I'm not a Windows user so I haven't tested this utility, but the magic command from the batch file is

Code:
\BIN\tar --create --format=gnu -b20 --quoting-style=escape --owner=0 --group=0 --totals --mode=644  -f %%~nG.tar %%~nxG

2) Download heimdall for Windows and use that to flash TWRP.


The above is open source. Heimdall can flash it using just the img format.

I run linux so I can retrieve it using

Code:
sudo apt install heimdall-flash

I have been using heimdall on linux for years to flash now without a problem.

3) use TWRP app as suggested by lpedia.


I haven't used the above so I have don't know how well it works or if you need root access.

PS. I've read that some versions of odin found on the Internet are hacked in some way. Since I'm not a Windows users, this doesn't affect me. If you want a possibly more reliable source for odin, see

 
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lpedia

Senior Member
Sep 18, 2020
157
76
Samsung Galaxy Tab S2
HTC 10
... I have been using heimdall on linux for years to flash now without a problem.

... PS. I've read that some versions of odin found on the Internet are hacked in some way. Since I'm not a Windows users, this doesn't affect me.
I mainly use Windows. When I first started dabbling with putting LOS on a Samsung device, I tried to use Heimdall and simply couldn't get it to connect regardless of which USB drivers were installed. I tried Odin, which worked without any such hassles, so have continued to use it.

I second your advice about sources for Odin. Odin is a Samsung internal app that's not meant to be available to the end user. It isn't supposed to be 'in the wild' at all, but over the years has apparently leaked. Downloading it from random places is very risky. Definitely use with caution and only from XDA links.
 

wjwjw

Member
Sep 24, 2020
5
1
YES!!! I finally got TWRP 3.3.1 installed. And then was able to successfully flash LineageOS and CRdroid with no issues. Now we need to pick one to use. :)

Thanks so much @retiredtab @lpedia for the help!

I strongly recommend TWRP 3.3.1 as it's what I use and test with.
You have the following options to get the TWRP 3.3.1 .img installed.
1) Odin requires it in .tar or .tar.md5 format. I'm not a Windows ...

I was able to open a bash shell on my Windows system and convert the TWRP.img using the following commands. Then pushed via Odin.

Code:
mv twrp_3.3.1-0.img recovery.img
tar -H ustar -c recovery.img > recovery.tar
md5sum -t recovery.tar >> recovery.tar
mv recovery.tar recovery.tar.md5
 
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retiredtab

Senior Member
Nov 16, 2017
824
393
Code:
mv twrp_3.3.1-0.img recovery.img
tar -H ustar -c recovery.img > recovery.tar
md5sum -t recovery.tar >> recovery.tar
mv recovery.tar recovery.tar.md5
Thanks for providing the code for future users. It's better to DIY than rely on some unknown script, bat or exe file. I put a link in my FAQ to point to this thread/post.

Glad you got it working. And pick whatever rom meets your needs. Both of them are Canadian made.
 

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  • 70
    Port of CF-autoroot for the Tab A and Tab A plus.
    Supports all models.

    See the link below for details:

    http://forum.xda-developers.com/showthread.php?t=3124284

    NOTE: does not support Marshmallow.
    To root MM install TWRP provided below and use Supersu.


    You flash this at your own risk. Please ensure you have the stock ROM to hand downloaded from SAMMOBILE in case of problems. This will trip the knox counter.
    Flash with Odin3 v3.10.6.


    Please post any feedback.

    NOTE: PLEASE DISREGARD ANY OF MY POSTS WITH REFERENCES TO http://galaxy-tab-a.proboards.com/ I NO LONGER WISH TO REMAIN A MEMBER OF THAT FORUM AND HAVE REMOVED ALL OF MY DEVELOPMENT POSTS THERE. THE NEW FORUM LINK IS http://galaxy-tab-a.boards.net

    SM-T550/T555/SM-P550/P555:
    https://www.androidfilehost.com/?fid=23991606952613365

    Stock recovery:
    http://www.mediafire.com/?kxl0r5bsk75322y

    SM-T350/T355/SM-P350/P355
    https://www.androidfilehost.com/?fid=24052804347758647

    Stock recovery:
    https://www.androidfilehost.com/?fid=24052804347758669

    Flash with ODIN 3.10.7 in the AP slot.
    Uncheck Auto reboot.
    Load the respective file above into the AP slot and hit start.
    After flashing and ODIN reports PASS immediately reboot to recovery by holding POWER + HOME + VOL DOWN.
    As soon as the screen goes blank change to VOL UP whilst still holding POWER + HOME.
    You should now see TWRP recovery.


    Guides:
    http://techchomps.com/how-to-root-the-samsung-galaxy-tab-a-9-7/

    http://forum.xda-developers.com/showthread.php?p=61757996

    Credits to Chainfire.
    Please give feed back.

    TWRP can be found here:

    http://forum.xda-developers.com/android/development/recovery-t3426560

    DONATE ME HERE IF YOU'D LIKE TO SUPPORT ME OR BUY ME A BEER>>>DONATE

    Thanks
    17
    Howto

    I didn't find any clear instructions on how to do this except for this french site. I tested with my SM-T550 and it worked like a charm.

    Download all files as described in OP, and Odin

    1. Turn off your tablet

    2. Simultaneously press the keys: Volume Down + Home + Power . Then press volume up to select download mode.
    3. On your computer, open Odin in administrator mode. Odin3-v3.10.6.exe in the zip file.

    888688odin3106.jpg



    4. Connect your tablet to your computer using the USB cable. In ODIN , the box under ID: COM will be in blue when it has detected your tablet.

    5. Click AP then select the file sm-t550_cf -autoroot.tar you downloaded.

    6. Check the boxes that only "Auto Reboot" and "F. Reset Time" are checked (look in the "Options" tab). Make sure the box Re-Partition is not checked.

    947858rootgalaxys6smg920f.jpg



    7. Start the root procedure by clicking the Start button and wait a few moments. The tablet will reboot, red android appear and some status message from the auto-root script and then restart in 10 seconds.

    8. At the end of the installation, you can disconnect your tablet from your computer.

    9. That's it, you are rooted
    7
    TWRP v3.0.0

    This is an update to the latest build of TWRP v3.0.0 for the SM-T555:

    twrp_3.0.0_SM-T555


    DONATE ME HERE IF YOU WANT TO BUY ME A BEER OR HIT THE THANKS BUTTON IF I HELPED YOU



    .
    6
    Hi, I'm happy to be constructive. I had to work on upping my post count just to post in here, and I don't know the intricacies of starting a proper forum area for the device. I assumed (incorrectly, I guess) that it was a simple question of simply creating one. Sorry if you think it's all whining, but I've tried to be polite and clear, and I've thanked you many times. I appreciate your work and effort. I'm trying to figure out a way to streamline things.

    So, why can't the files be properly posted in this thread along with an updated initial post explaining the process?

    Thanks again.

    Because this thread is about rooting not anything else.
    Contaminating it with all sorts of other stuff just takes it off topic.
    I have been gracious enough to post links here to my builds of twrp and custom roms to help people out.

    Nobody here has a god given right to demand anything. I do this for free and don't expect anything but a thanks.
    Many developers leave XDA and give up development because of this kind of stuff.
    6
    What's this?:


    It's basically a rom for the SM-T555*I created for myself to use Xposed.


    UPDATE:*

    SM-T550 version added

    Supersu v2.56
    Xposed v75

    Features:


    XXU1AOJ1 Base_update 8.10.15

    Deodexed

    Deknoxed

    Lightly debloated so as not to lose functionality.

    Rooted with latest Supersu v2.56 binaries.

    Xposed framework.


    Install:

    Install via TWRP recovery.

    No need to wipe, but if you want a minimal system then its advisable to wipe DATA in recovery.

    First boot will take around 10 mins.


    Disclaimer:

    As ever you flash this at your own risk, its up to you to ensure you have a backup with TWRP and/or the stock firmware to hand just*in case the Hells Angels decide to ride into to town and kill your device.



    NOTE: I'm not really going to support this ROM with updates and such. It is what it is, and its up to you to modify it as you wish, more debloat e.t.c., take it or leave it, just leave out the whinging and whining.*


    Link:

    UPDATE :New firmware base uploaded. Xposed updated to latest version v75.
    Minimum requirement is to be running the same stock build XXU1AOJ1 before install.*


    SM-T555.....*www.androidfilehost.com/?fid=24269982086996227



    SM-T550.....*www.androidfilehost.com/?fid=24269982087000057




    CREDITS:*Me, Chainfire, Rovo89, arter97, Samsung




    Hit the*THANKS button any time you like.*