yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
I think this is not a software problem, that is, firmware, since the same firmware is used by other users of the tablet, but purchased earlier. I suppose the problem is in the hardware and even the marriage! try to just install the original OS 10 android and then install the previous OS 9 android. They have the same bootloader version 3, which means that something like this is allowed by Samsung, and if there is no image on Android 9, then this is a marriage and the device must be replaced in a Samsung service center with a working one with a working display ...

P.S. rollback from 10 to 9 android is done with data reset, that is, use the CSC file, not HOME_CSC

P.P.S. I'm afraid with such a display it will not even be possible to officially update to Android 11, which will be on our device in the fall.
[Samsung Galaxy Tab A series Guides, News, & Discus] patmasxda:
i came to the same conclusion :(

i think there is a new hardware protection from Samsung !

thanks for your time (y)
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
Are you going to try to install Android 9, just to see if you can?
[Samsung Galaxy Tab A series Guides, News, & Discus] patmasxda:
yes ! i want to test.

where can i find the files ? or there is a way to downgrade directly via Android interface ?
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
only flash through ODIN firmware for 9 android.

what region is on the device? I will post the required firmware on GoogleDisc.

You can download it from here: https://samfw.com/firmware/SM-T290

(Download on website)

I recommend the latest firmware 9 android type T290 ... 3A ...
[Samsung Galaxy Tab A series Guides, News, & Discus] patmasxda:
Phe from Spain

T290xxu3buc1
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
T290XXU3BUC1

3- bootloader version

A - 9 android

B - 10 android

Firmware T290XXS3ATF1 :

T290XXS3ATF1_PHE_20200611170034.zip

drive.google.com
[Samsung Galaxy Tab A series Guides, News, & Discus] patmasxda:
do you think that i can root my tablet if i downgrade it in 9 ?
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
To root the T290XXS3ATF1 firmware 9 android

you need to unlock the bootloader and flash the patched Magisk kernel, I will attach the file:

P.S. if the bootloader was unlocked, then it will remain so during resets and flashing ...

P.P.S. recovery TWRP you can install it later via ODIN, or with the Flashify program already having Root rights ...

But the main thing is that the device works normally on the stock firmware T290XXU3ATF1, that is, there is an image;)
[Samsung Galaxy Tab A series Guides, News, & Discus] patmasxda:
you don't think that i'll get a black screen, if there is hardware security on lastest tablet ?

to downgrade, i need to flash BL + AP ? boot_vbmeta_T290XXS3ATF1_Root_M20.4.tar + T290XXS3ATF1_PHE_20200611170034 ? or only AP ?

because if i'm using the same TWRP and BL, i don't know how it will work....
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
First, flash the full firmware T290XXS3ATF1, the link to which is posted above. Sew all 4 files BL, AP, CP and CSC (not HOME_CSC), since rollback (downgrading the android version is possible only with data reset).

If the device works fine, then proceed to rooting, for this you will need to flash the boot_vbmeta_T290XXS3ATF1_Root_M20.4.tar file and install the MagiskManager application after downloading.
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
If there is no image on android 9, then this is not protection, but a banal marriage of the display.

This is my opinion and it is based on messages about replacing broken displays with original ones, but for which, after the update, the touch stops working, and when you roll back to 9, the android image disappears ...

I have a device of production 2020.10.10 and it works on any firmware 9 and 10 android ...
[Samsung Galaxy Tab A series Guides, News, & Discus] patmasxda:
i'm going to buy a Lenovo M8 second gen... ;)
[Samsung Galaxy Tab A series Guides, News, & Discus] 92millmac:
I have firmware version T290XXU3BTI2, will the above files still work to root?

Thanks to all
[Samsung Galaxy Tab A series Guides, News, & Discus] patmasxda:
i think you can try this TWRP version : https://androidfilehost.com/?fid=17248734326145708161
[Samsung Galaxy Tab A series Guides, News, & Discus] 92millmac:
Alright ill try it out. What about the patched magisk root file? Will the above work? Or will I need to patch my specific firmware to obtain root?
[Samsung Galaxy Tab A series Guides, News, & Discus] patmasxda:
you have to unlock bootloader

if you can boot on this TWRP file (if screen working) you can copy 2 files on sdcard : Fix_vendor_10.0.zip and magisk.zip

you have to use odin in download mode to flash in AP the TWRP

you can find instructions here : https://xdaforums.com/t/recovery-unofficial-twrp-3-5-2-for-2019-galaxy-tab-a-8-0-sm-t290.4185235/
[Samsung Galaxy Tab A series Guides, News, & Discus] 92millmac:
Very much appreciated! Bootloader is unlocked, I'll give it a try and let you know how it goes
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
When using files patched by Magisk, but for a different firmware, the result will be a non-working Wi-Fi.

Therefore, either patch the files from your firmware, or root the device from TWRP, which is easier, except for the feature of entering TWRP after installing it.
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
I can't say anything about Lenovo, since I only use tablets from Samsung from the very first model GT-P1000

P.S. an update has been released for the T290 model, this is the T290XXU3BUE1 firmware for the OXM multi-region, which includes the PHE region.

The bootloader has 3 versions left ...

Would you like to try installing?

Perhaps something has been corrected for the display and it will be possible to root ...

Here is the firmware on GoogleDisc: https://drive.google.com/file/d/1Qin91Q20dxTr7DaFft9uxEMoLIYYeZTF/view?usp=sharing
[Samsung Galaxy Tab A series Guides, News, & Discus] 92millmac:
Success! I have root and everything is working beautifully. Thanks so much! All you guys here on XDA are the greatest!
[Samsung Galaxy Tab A series Guides, News, & Discus] patmasxda:
bought a Lenovo M8 HD and get it root successfully (y)
[Samsung Galaxy Tab A series Guides, News, & Discus] zrex:
I went through this guide https://topjohnwu.github.io/Magisk/install.html#samsung-system-as-root to try and get magisk setup for root and it is giving me secure check failed for both boot and recovery. I didn't have TWRP installed.
[Samsung Galaxy Tab A series Guides, News, & Discus] quera:
If I root this T290, will I be able to move apps to sdcard? Only 10 of 32 GB are reserved for user apps. Shame samsung.
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
No, Root rights will not give this opportunity :(

Update the firmware to 11 android and the function of transferring applications to a memory card (standard) will become available;)
[Samsung Galaxy Tab A series Guides, News, & Discus] aaytar:
Hello friends. I cannot get my Sm-T290 out of prenormal mode. Can you help?
[Samsung Galaxy Tab A series Guides, News, & Discus] Viggen66:
Also whished to do that, mine is locked as well, can't do anything
[Samsung Galaxy Tab A series Guides, News, & Discus] Heeni:
@aaytar , @Viggen66

What version of stock did you have when you bought the tablet? If it was Android 9, you may be able to reinstall Android 9 stock, let it go online and re-register, and go from there. (I had to do that at one point.) If it was Android 10, I'm sorry, I can't help with that.
[Samsung Galaxy Tab A series Guides, News, & Discus] aaytar:
I had Android 9 when I bought it. It went to warranty and came. They installed the latest version, but I went back to android 9 again. now on android 9. I tried the actions on youtube but in vain.
[Samsung Galaxy Tab A series Guides, News, & Discus] V0latyle:
This is what I just did on CUF8 (Android 11 XAR CSC), previously unlocked the bootloader

Flashed everything with Odin (to force a factory reset, used CSC instead of HOME_CSC)

Rebooted tablet to Download mode

Flashed TWRP 3.5.2_9-0 to AP with Odin

Rebooted into TWRP

Flashed Multidisabler 3.1 to disable encryption; formatted /data

Rebooted into TWRP, flashed Magisk 23.0

Rebooted into system, have working root

If you're unable to unlock bootloader using newer firmware, you can downgrade using a patched version of Odin here

I unlocked the bootloader when I first got the tablet before even setting it up; I do remember having difficulty getting to the bootloader unlock screen after enabling OEM Unlocking; I believe the trick was holding Vol + and Vol - with the tablet off while plugging in the USB cable
[Samsung Galaxy Tab A series Guides, News, & Discus] themace51:
Anyone know of a fix for the blank screen when flashed TWRP?

On firmware T290XXU3BUC1?

Should i try and update the firmware and then try and flash? see if that fixes the blank screen?
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
On the T290 model, you can sew at least 9, at least 10, at least 11 android, since so far the bootloader version 3 is everywhere :)

At the same time, the disappearance of the image is not sure what is connected with the protection, rather it is a defective display ...

But we need checks and statistics ... The devices of the old production (a year ago) did not have this property, although the firmware on them is installed the same ...
[Samsung Galaxy Tab A series Guides, News, & Discus] themace51:
I have tried rooting with TWRP but i get blank screen. I have also tried to patch the firmware.

I have firmware T290KOO3BUE2/

I have tried different methods, and wondered if i have done something wrong.

I have tried the direct patch the AP, that fails with secure check failed vbmeta, while flashing in download mode, shows on the tablet screen.

I have tried extracting the boot, recovery, vbmeta, making tar, patching them with magisk. dd command to fill the files. Put it all back together, and try to flash, and i get the same secure check failed vbmeta.

I am doing something wrong? It is driving me mad.

Posts say you have to go to recovery and wipe device.

I have tried this

Do i have to let it go to blue screen to erase and go to recovery after? as if i try before that

i do not get the standard recovery page, i get 4 lines saying power off - recovery - fastboot - reboot.

If i go to recovery, it goes to a download mode but with black screen instead of the normal blue screen.

If i choose fastboot, nothing happens, and restarts.

After the erasing screen, i can go to the normal recovery mode, and can wipe -reset it, but no magisk and the firmware boots up ok but without magisk, i have installed the magisk apk, but says NA and tried a root app and fails to get root.

Driving me crazy :(

Thanks
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
Please read earlier posts.

SECURE CHECK FAIL: vbmeta

does *not* mean you have failed. I got this message the time I succeeded.

From what I remember, after downloading with Odin, go directly to recovery to wipe data. If Android boots before you wipe data, I think you have failed, and should start over.

Once you have wiped data, you have to meet the challenge of booting towards recovery, without getting to recovery. I think it was @gcrutchr who gave me the tip I needed to find the right moment to release the buttons.

If you get to Android, but there is no sign that Magisk is installed and running, *do*not* go back to Odin. Shut down (Power Off). Try booting again. At least a dozen times. This is a very fussy step. You have to hold the buttons to boot to recovery, because Magisk is in recovery. But you have to release the buttons before Magisk checks them, because that's how Magisk decides between letting recovery boot and run, and Magisk keeping control and booting Android. It is miserable. There is no sign that Magisk is in control until long after Android has booted.

Every time Android comes up (when you are still trying for that first successful boot of Magisk), you have to run the Magisk Manager app. (If you don't see it in your app drawer, you have to install it.) The app has panels that talk about the status of Magisk and of Magisk Manager. More importantly, the first time Magisk is in control, the Manager will say something like "need to do some more setup". THIS is the sign that you have succeeded: You managed to install Magisk, and you managed to trigger it.

This has all been covered, repeatedly. In @topjohnwu 's installation notes. In posts in this (or maybe one of the related) thread. It will be a relatively early post.

UPDATE: I just read a post in the Magisk thread that says (since version 16) Magisk checks for a copy of the Manager and, if necessary, installs a stub. So maybe if you boot and don't find a Magisk Manager app, that *is* a clear sign that you have not triggered Magisk. But if you install the app once (after wiping data), you won't need to install it again, no matter how many times you reboot trying to hit the sweet spot.
[Samsung Galaxy Tab A series Guides, News, & Discus] lewmur:
The whole purpose of replacing the vbmeta is to MAKE it fail. If it didn't fail, you'd only be able to flash "official" stock images. It is the part of the boot process that checks to make sure the ROM is "official".
[Samsung Galaxy Tab A series Guides, News, & Discus] themace51:
Hey thanks for the information.

I have tried so many times, but still does not work.

I have wiped straight after odin flashes

I have tried to do the magisk recovery, no magisk when loaded.

I guess i am doing something wrong, but thanks for the help :)

If only the blank screen TWRP was fixed :(
[Samsung Galaxy Tab A series Guides, News, & Discus] themace51:
Update

I have a feeling the firmware is not flashing with the patched AP.

I installed the firmware, and debloated many apps as i gave up trying to root

I decided to have a few more tries trying to root.

I installed the firmware with magisk patched files (success with odin). I do a wipe/reformat. Tried to start the tablet with magisk recovery, loaded up android.

No magisk and also the apps that i disabled, are still disabled.

Tried again, Odin flash - success , recovery - wipe/reset - let android load up - apps still missing

I then tried to flash the original firmware without the magisk patch. Odin flash - success, recovery - wipe/reset - let android load up - all apps are back

Maybe this is why magisk is not working? But if i am getting success with odin, why is not flashing?

So confused.
[Samsung Galaxy Tab A series Guides, News, & Discus] Reick7:
really confusing, but from what you said, maybe you started without magisk, this is possible because magisk is initially installed on the recovery partition, as far as I know, that's why that it's interesting to put the TWRP to root
[Samsung Galaxy Tab A series Guides, News, & Discus] themace51:
More updates

I tried to downgrade to T290XXS3ATF1 which worked but blank screen like Twrp

I then flashed -T290XXU3BUC1- which worked and had my screen back.

I then extracted the files for magisk and packed in tar with the other l4z files.

Flashed and Odin (modded) failed :(

So now I am at an even more loss :(
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
What "other lz4 files"?

What do you mean "Odin (modded) failed"?
[Samsung Galaxy Tab A series Guides, News, & Discus] themace51:
Hey

A guide explained to extract boot, recovery . vbmeta and put them in a tar and patch them with magisk. Then to add those 3 files with dtbo.img, modem.bin.lz4, vendor.img.ex4.lz4 etc etc and compress them to tar after padding them and use this as the new AP to flash with odin. When i do it like this, Odin failed.

I have tried to patch the original AP with magisk but that fails with Secure check fail : recovery.img

I tried to add just the boot, recovery, vbmeta (compressed to tar), but again that fails

Odin Patched, is on this thread, but saying that, i have used the patched and also the normal odin but still the same results.

https://xdaforums.com/android/software/patched-odin-3-13-1-t3762572

https://xdaforums.com/t/root-for-sm-t290-tab-a-8-0-2019.3965624/page-3#post-82487527
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
What guide talks about dtbo.img, modem.bin.lz4, vendor.img.ex4.lz4? (Your post is the only mention of dtbo.img in this thread.)

I think if you have flashed the full, unmodified, AP.tar, then to install Magisk you only need boot,recovery,vbmeta in a tar that gets patched.

Have you read the last 200 posts in this thread? (You should also check the T295 thread.)
[Samsung Galaxy Tab A series Guides, News, & Discus] themace51:
Hello

I have done it this way as well, and that fails with odin too.

I have :( hence the different methods i have tried.

After failing and failing , i tried the very first post of this

SM-T295 - Finally rooted tablet!! (updated 19-March-2021)

I have root on my SM-T295 A8 tablet!! See my new post: How to Install TWRP and Root T295 Update 19 March 2021 Tested on T295XXU3BUC3 ROM Prerequisites: Bootloader unlocked - search forums.xda-developers for instructions how to do this. OEM...

xdaforums.com

as TWRP does not work for thi tablet due to blank screen

The images below are example of using just the boot, recovery and vbmeta in a tar
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
To root the T290XXU3BUC1 firmware, use the attached files. Select files as parts of BL & AP . after the firmware, update or install the Magisk Manager. apk of the current version and update the Root rights from it...

P.S. The first file is the loader of android 9,without it it is impossible to root android 10 and 11...

Zip files pre-unpack to tar
[Samsung Galaxy Tab A series Guides, News, & Discus] themace51:
Hello

Thank you for the files, but afraid this does not work, it does succeed, but i get the blank screen bug like with TWRP :(
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
I'm losing track. Have you confirmed that your system version is low enough for you to have any hope of flashing modified files?

If you cannot flash the unmodified stock ROM files, you need to start there. You need to be able to do this to recover from mistakes. You should be able to do this even if you have not unlocked your bootloader. If you cannot do this, either you have some other problem (bad USB port or cable; corrupted file; I don't know what else), or you are misinterpreting something and the Odin step is actually succeeding.

My first test was flashing a stock ROM for another language: when Android booted and displayed another language, I finally believed Odin was really downloading and the bootloader (or the download mode) was accepting what had been downloaded by Odin and burning it to my tablet. At that point I burned the English ROM and believed I would be able to do it again when needed.

That "first post" you cited has to be read carefully. It is an amalgam of the true first post, and at least one update with more recent developments. The instructions you need to follow are not necessarily the last unstructions in that post.
[Samsung Galaxy Tab A series Guides, News, & Discus] themace51:
Hey

I think the problem is that if I put android 9 bootloader or twrp , I get the blank screen bug that has been mentioned before.

Seeing as I have bootloader v3 and android 10 , thought it was possible to root, but I think the blank screen is stopping it, even thought it works but with no screen. I can load into twrp and flash a custom ROM with adb but just can not see anything on the screen :(

J.Michael sorry if I have confused you.
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
What firmware do you have when the screen is working? At least once you said you have firmware T290KOO3BUE2/.

Is the blank screen only when you run TWRP? Does the Android system boot and display, even though the TWRP will not display?
[Samsung Galaxy Tab A series Guides, News, & Discus] themace51:
T290KOO3BUE2 screen working

T290XXU3BUC1 Screen working (it is currently on this one atm)

It seems anything that has Android 9 e.g. S3ATF1 And TWRP, no screen. The moment reboot , blank screen. I can guess going into twrp and using adb. I can load into android but no screen, as i hear the sound notifications. No splash screen , no warning, no nothing. Just blank screen with backlight on.
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
@Talich52, do you think @themace51 could use the firmware you posted for @92millmac?
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
The stock firmware can be any, but for this model ... You can install and try to root, but I recommend starting not with changing the firmware, but installing the bootloader file from the 9 android aboot_vk_T290XXS3ATF1.tar, posted above.

If there will be no image on the screen, which means that Root-rights cannot be obtained on this device :(

I suppose the problem is in a faulty display, more precisely modified and working only with the current firmware ...
[Samsung Galaxy Tab A series Guides, News, & Discus] Languor:
im really hoping someone can help me fix what i just did....

in odin, i selected erase nand and flashed the factory android 11 files..... now my tablet hangs on samsung logo and reboots now and then...

a search told me i need to repartition with a .pit file? it says it can be found in the csc file.... but i dont find it there.....

my tablet is the canada version i think, 32 gb

edit: so i finally fixed it after some digging and i want t share in case one of you get stuck like i did.

in odin, i added the ap, bl, csc, and cp files (i kept the bottom field empty). i checked nand erase and re-partition. i went to the pit tab and selected the pit file i got from the web, (full-repair-firmware dot com)

and it now is booted up.
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
After applying Nand Erase All, sometimes the device does not boot and you need to go to recovery and perform wipe data. In fact, format data and format cache are made, after which the device will boot :)
[Samsung Galaxy Tab A series Guides, News, & Discus] Viggen66:
My T290 came with Android 10, if I'm not mistaken, Spanish tablet, it has the black screen whenever I want to unlock the tablet, now even OEM unlock doesn't appear, and don't know how to revert it.
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
Have you tried flashing the stock firmware?
[Samsung Galaxy Tab A series Guides, News, & Discus] Viggen66:
Michael,

Yes if I flash stock rom that came with the tablet, the screen is back again.
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
And if you flash another firmware, but also a stock one? Has the tablet been updated and successful? Or just sit on the original firmware? ;)

Most interestingly, is it possible to install firmware 9 of an android type T290XXS3ATF1, that is, with the same version 3 of the bootloader? In general, this is allowed, we do not downgrade the version bootloader ...

If the Android 9 firmware is installed and works, then the device can be rooted. If there is no image on Android 9 either, I suppose the device should be returned under warranty, as with a faulty display or board ...
[Samsung Galaxy Tab A series Guides, News, & Discus] predatorisback:
Guys help!

I flashed these files and now i get this message when i turn on the tablet

any help would be appreciated!

How can i fix this?

I just wanted to install TWRP (which worked) and then root my tablet (sm-t290)