yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
Okay. I still have one bug: the cast icon stays when you just reboot the device and says that you are casting to a device you were casting to, while you don't anymore.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] tymclrewhjbcpo:
Is vbmeta.img at https://download.lineageos.org/devices/gtowifi/builds disabled? I'm facing with SECURE CHECK FAIL : boot.img at the moment, I consider taring and flashing it via odin.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] lifehackerhansol:
Yes, it's disabled.

Are you actually able to boot a recovery at all? Usually this implies you have a later revision model that is incompatible with this device.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] tymclrewhjbcpo:
I'm unable to boot into recovery. I'm trying to figure out the reason why the tablet attempts to secure check the firmware when the bootloader is unlocked. I will try locking and unlocking the bootloader to see if anything changes.

P.S. I downloaded the official build using odin and I attempted to lock the bootloder. After locking the bootloader, The tablet began failing to boot. It loops into download mode giving <!> partition vbmeta error.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
1: Why would you lock the bootloader at this point?

2: I see your bootloader version is version 4? As told, this will not work with that version and downgrade is not possible. Or is it just the vbmeta.img based on the tablet firmware with version 4?
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
same for me. not lettingme boot secure boot fails . can not bypass avb.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
do you have any luck with that ??
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] tymclrewhjbcpo:
I don't know, I just wanted to try out locking the bootloader. If I'm on the official build and I can't boot into Android after locking the bootloader, probably there is a problem with the firmware and it might get patched by the next build (if Samsung ever releases it).

I'm currently trying to install android-sdk to get make_ext4fs tool to create system.img.ext4 from system.img alongwith vendor.img.ext4. Then I will compress them to lz4, also boot.img, dtbo.img, recovery.img and vbmeta.img. Lastly I will store all with tar, then flash it to AP alongside the official BL, CP and CSCs. If it fails, I will give up because I have tried everything. Even I'm unable to root the tablet at the moment.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
please let me know the result. i'm going to do the same thing. if you want guide for every step i will help you
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
[GUIDE] [T220/T225] Flash a GSI on the A7 Lite (without TWRP)

Hi everyone, this is a short guide on how to flash a GSI on the A7 Lite (without TWRP). Its a nice little tablet for the price but it doesn't have a very powerful SOC and for me the One UI is barely usable on this device. The launcher and the...

xdaforums.com

use this guide. this one has all the tools and scripts to automate the thing.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] tymclrewhjbcpo:
Well I used brotli to extract dat.br to dat for system and vendor files. Then I used a tool called sdat2img to convert system.transfer.list and system.new.dat to system.img through pyton3, finally added the extension ext4 since it was already ext4 (no need to use mkfs.ext4). I did the same instructions for vendor. Finally I put all these files alongwith boot.img, dtbo.img, recovery.img and vbmeta.img from lineageos zip file and the remains from official AP file. I compressed all with lz4, then bundled all with tar. I flashed this custom file to AP, alongwith samsung's official BL, CP, and CSC files via odin.

It successfully flashed, but it says SECURE CHECK FAIL : boot.img

The only thing you can do is waiting for a software update from samsung, because I'm out of ideas.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
do you know how to patch bootloader. i tried to patch it using ghidra. i went through all error messages and code blocks. can you tell me how you got the unlocked boot abn. is there any way we can bypass the secure boot or signature verification
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
i will find a way for sure and i will post here once i'm successful
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
This is because your bootloader version is 4 and will refuse to boot any custom images. The boot.img you are trying to flash is not stock, but one made for use with LineageOS! If you want it to work, you must flash the stock firmware using Odin in order to get this tablet to work again. However, you are already bootloader version 4 so LineageOS is already out of luck now, unless someone gets to downgrade and/or bypass Samsung's new strict bootloader.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] tymclrewhjbcpo:
I was receiving the same error when I was trying to flash the lineageos recovery, it was solved when I installed twrp. Maybe it's up to this rom which is giving the SECURE CHECK FAIL errors. I'm not a power user that my brain was almost melt working with mkfs.ext4 and sdat2img.py stuff on wsl.

I wonder why isn't twrp receiving support for bootloader 4, I'm unable to install it because of the SW REV CHECK FAIL : [aboot]Fused 4 > Binary 3 error.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
mine is version 3 . but facing the same issue.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] tymclrewhjbcpo:
It bootloops while attempting to boot with official boot.img, but custom system.img.

The only way to use custom rom with stock recovery is (at least it used to be this in the past, I don't know today) rooting the device. The problem is you need to modify recovery.img and attempt to boot to recovery to enable root for the session, but you'll end up with SECURE CHECK FAIL : recovery.img error probably.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
are you using XAR CSC. try using some indian (INS) or other ones. i faced this issue in SM-T220 and i was successful then. try flashing blank vbmeta first
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
Don't use the .IMG files from LineageOS site, but the AP, CSC, etc. files. It includes the stock boot image which gets flashed. The SECURE CHECK FAIL error pops up for devices that have the updated version of the bootloader installed now, even though it worked before. I fortunately did not upgrade, so it is still working for me without any errors, only a warning screen telling that the software is unofficial or the bootloader is unlocked.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
can i reflash it with CVG3 or CUF8 versions of bootloader. will it work then??
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
Wait, version 3? Show me an image of the tablet in download mode. I can link you to my installation guide, but I recommend to first flash the stock firmware with bootloader version 3 first, to make sure it fully goes straight from the beginning, ensuring a successful installation. The guide worked for most people, so!
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
CVG3 would work.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] tymclrewhjbcpo:
My tablet is SM-T290, it doesn't have carrier neither IMEI

Why would it be related to CSC anyway?

I won't be able to flash AP due to [aboot]Fused 4 > Binary 3
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
please share the guide. i will share the image in few hours
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
You are out of luck for now then. But you can prolly just reflash stock fully and it would work fine. @shyamjayakar143 however still has bootloader version 3 and a high chance of succeeding. Let me get the guide in a moment...
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
There we go:

https://xdaforums.com/t/guide-insta...m-t295-with-google-apps-mindthegapps.4552491/
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
but for some reason i can not flash TWRP. when i flash android 9 bootloader i'm getting black screen. that is the problem. can i flash LOS recovery directly??
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
Oh, your tablet probably shipped with Android 10. Maybe installing directly would work, but not sure. Even though it is a black screen, it does work though. But it is just invisisble. If you would enable ADB on stock and then use screen mirroring, you would be able to see the screen. I don't know however whether this would work with TWRP. But once you have LineageOS the screen might work for the OS but not sure.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
thanks brother . i got it. i will use twrp command line to do the job.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
this is my download mode screen. is anything wrong with my device
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
The bootloader looks like it is version 3! Nothing to worry about. Only need to get around that black screen somehow. But don't upgrade pass this version! This is the last version where it will work on
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] lifehackerhansol:
The bootloader isn't patched. We use a very early version of the bootloader (I believe the first or second stock ROM to have ever shipped) which actually respects the vbmeta settings.

I don't know whether reverse engineering the aboot will really solve the issue. I can't seem to figure out where the issue is, either (I've thrown it in ghidra at one point as well). That's before even thinking about whether a modified aboot will even boot on the device.

So we're stuck until someone with legitimate hacking experience finds out. Which is probably rare for a cheap tablet where I'm the only one tinkering with it.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Annenyanimda:
I think Samsung are preparing another update for T290. Do you think they will allow Custom ROM again?
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
Not sure. Where have you heard that and why you think?
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] SunSlide:
Normally once a company locks there stuff down, they never go back. Wish there was a way to change this
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Annenyanimda:
I'm just looking at the Check Firm app for new software updates every day. And I saw that they were testing a new software for T290.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
if i flash android 9 bootloader then blank vbmeta then android 11 bootloader will i be able to get rid of secure check failed error
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] lifehackerhansol:
No.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
@lifehackerhansol @Minionguyjpro do you have any idea why people are getting black screen. or a way i can get boot log ??
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
It happens with people that have a device shipped with the Android 10 bootloader. Those devices don't like the Android 9 bootloader because of it being older...
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
okk. do you know how to get past the secure check fail errors. if i can bypass this. i can complete the whole process
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Dharmtej:
In which bootloader did you try man ,
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] xperiazu21:
On Android 9 Bootloader
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
When does that error exactly happen? After flashing what?
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
it's happening with android 11 bootloader. CVG3. i can't flash anything
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Dharmtej:
Does this work on Sm-t295 by any chance? I have CVE4 My tab is running stock Android 11
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
This works on SM-T295, but you will lack support for LTE. Maybe you never used LTE, so this might be no problem.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] xperiazu21:
No, non-stock roms only boot on version 3 of the android 9 bootloader. Since the bootloader cannot be rolled back, you will not be able to use this rom.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
Oops, you are right. It will work on the SM-T295, but since you are on the bootloader of version 4 the answer is no.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
Have you tried flashing TWRP? May I see a photo of your bootloader version again? Version 3 should allow flashing bootloader 9 (baked into TWRP). Then it would work.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
@Minionguyjpro this is by download mode screen.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Dharmtej:
Does this work with sm-t295 running Android 11 ?
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] xperiazu21:
I have already replied to the explanation before.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Dharmtej:
Is there a

can you whether its ' in version 3 or 4 cuz iam confused between bulid number and baseband version
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] xperiazu21:
Mainly focus on the build number. The fifth digit from the bottom of the number is the version. You are now T295XXU4CVE4, so you are on version 4.

Unlike T290, T295 introduced version 4 bootloader in the last android 10 update. It means that as long as it is updated to android 11, the non-stock rom cannot be started.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Annenyanimda:
They updated the bootloader to version 5... and I'm probably stuck in this slow ass Samsung's bloatware ROM.

if i could go back to when i bought this tablet i should add some money to my budget and buy an used ipad.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
I just saw that. Maybe someone can do testing on bootloader version 5? It probably won't get better but you never know.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] lifehackerhansol:
According to the Russian people over at 4pda it doesn't get any better.

Maybe y'all should shoot Samsung an email to fix their bootloader. This is not an intentional design choice, it is a bug in their vbmeta code.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Minionguyjpro:
Wait, really? I can send one, but I guess you send one too? If we have enough people to email they might fix it. I don't know whether there is any hope as I have never actually got a company to fix their software when I contacted them bur we can give it a try.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Annenyanimda:
If we send our request to the same email address, maybe we can get results in a shorter time. Which email address should we send it our problem to?
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] temporarium:
Sorry to burst your bubble. Samsung wants you to buy new products, not extend the life of old ones. They're in it for the money.

What you need is a hacker that will crack the bootloader.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] G_Bot:
Hello i have been reading the comments here. i was gonna mention that i flashed this rom on my sm-t290 on stock 11 and it worked for me. the only thing was i had a little problem getting twrp to boot, it wouldn't stay flashed at first. But i got it to work by holding the volume up button in odin and auto reboot.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] The Lonely Ranger:
Hi,

I have a Wi-Fi version of this device (Indian variant) with build number T290XXS3CVK1 running A11 with oct’22 security patch. Can the boot loader of this device be unlocked ?
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] 2faraway2:
In theory: yes ... :unsure:

But imho it depends with which android version your device was delivered:

If with Android 9, then it should work even in practice .. :)

If with >= Android 10 then you'll most likely get a black screen when attempting to install the recovery ..
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Dharmtej:
Can I get root in my stock rom itself by flashing twrp ?
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] The Lonely Ranger:
It was shipped with android 9.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] 2faraway2:
Then chances are good, I would give it a try ... good luck :)
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] 2faraway2:
Unfortunately no, to flash any 'non stock piece of software' you have to have an unlocked bootloader ..
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] T290userxd:
Guys my T290 is in bootloader version 4 and I saw this method for downgrading binary on internet. How can I use this? or this will brick my tablet? Ty.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] 2faraway2:
You won't brick your device but it'll simply not work .. You can't downgrade the bootloader version (as the author also mentions in this article ;) )
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] yzydog:
well **** done a stupid and update tablet in atempt to make it usable as i found for 25$ before i check and now it stuck onT290XXS4CWA1 i hope at some point we can figure out how to flash s4 also
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
anyone found the solution for black screen ??
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] The Lonely Ranger:
I was able to unlock the bootloader and install lineage os. I followed the normal unlock procedure for samsung devices, not the one mentioned in lineage os site. Everything working fine.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
if i got the bootloader source code of samsung. would i be able to build a custom bootloader ??
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
is your device shipped with android 9 or 10 ??
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] The Lonely Ranger:
Android 9
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] The Lonely Ranger:
Is there a dt2w or raise to wake option availabe? I cannot find it in settings. when i search for "lift to check" it shows in the search option but its not available in settings. can you please add double tap to sleep and lift to check options, it would be really helpful. @lifehackerhansol
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Annenyanimda:
If we encounter a black screen after installing TWRP, is it possible to restore the tablet to its stock state?
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
yes. reflash the stcok rom
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] NHALE0102:
I need help, I need someone to teach me step by step, when I get to the part about arrowing the AB, at the end of the pass, but when I try to start nothing, I get the error: security error this phone has been flashed with unauthorized software .

I'm following the lineage site step by step, please I ask someone help me ;w;
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
have you found any solution ??
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] The Lonely Ranger:
please be more clear, cannot understand your statement.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] NHALE0102:
I can not put the recovery of lineage os, da a security error after inserting in the tabl et
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] G_Bot:
I had the same problem also at first. What worked for me was to hold up the volume up button with auto reboot enabled in odin to force twrp to open. then after that i flashed multidisabler and then i flashed the rom.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] NHALE0102:
Do you have any method of communication!? Not even twrp could install
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
guys i propose two ways to overcome this issue but there are some issues preventing us from flashing custom firmware. primary goal is to flash gsi as system.img. i tried https://xdaforums.com/t/guide-t220-t225-flash-a-gsi-on-the-a7-lite-without-twrp.4456821/ this method to flash gsi . i'm getting "SW rev Check failed device 3 < binary 0 " something like this. and other way by flashing lineage os directly to android 11 bootloader . this way i'm getting "security error: phone flashed with unauthorised software issue" . if we can solve any of this issues we can successfully flash software.

my device is T290 international model, shipped with android 10 bootloader,
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] NHALE0102:
XnX
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] NHALE0102:
I hope another way will be found soon
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] temporarium:
No to be rude either, but if you don't know how to read with understanding, you should not be doing this - you'll only mess up 😉
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] NHALE0102:
Ok Thank You
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] TuRkiShArmY:
Any custom things for T290XXS4CWC1 or T290XXS5CWG5 ?
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] 2faraway2:
No, no chance with bootloader version >= 3
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
is there anyway to unpack repack system.img or edit system.img
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] shyamjayakar143:
@lifehackerhansol any reported solution for black screen issue. or any way to unpack repack system image or flash gsi ??
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] gored103:
One question about SMT290 tablet (gtowifi) that I found completely destroyed and repaired and was looking forward to install a custom recovery and rom but when I was searching, I've seen what people say that bootloaders versions have been updated and now it is impossible to unlock it.

T290XXS5CWG5//T290XXM5CWG5 - BOOTLOADERv5 // A11

It is a bad idea to try the usual way of unlocking the bootloader or would there be another option? is it impossible?

On developer options i still have the OEM unlock option activated but reading what people are saying im afraid i will hardbrick the device.

i managed to get in download mode inside the bootloader (via recovery), do u think it would be a bad idea to try and unlock it?

Thanks in advance,
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] lifehackerhansol:
@2faraway2 I'm aware you are one of the people with issues with TWRP.

I tried my hand at a LineageOS recovery. If you do not mind, can you try flashing it? https://sourceforge.net/projects/lifehackerhansol-android/files/gtowifi-lineageos-recovery.tar

To ensure a clean base, flash an entire stock ROM, and SPECIFICALLY the latest stock ROM in Odin. Then flash this custom tar in Odin as usual, AP slot etc. I currently don't have access to Windows so I can't test Odin at the moment. But the contained files work when I flash it separately on my own device, so theoretically there shouldn't be a problem(?)

If this works, I'll try my hand at TWRP next.
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] 2faraway2:
Wouww, I'm very impressed, thank you ... :)(y):)

Feedback can take a couple of hours because I'm busy atm ..

If LOS recovery will flash without any issue then it would also be possible to flash your custom rom directly after ... right ?
[Samsung Galaxy Tab A series ROMs, Kernels, Recover] cdepping:
Hello, many thanks for your 20.0-ROM, it runs very smooth, flashing from 19.1 with twrp was also no problem. Only thing is that i can't use bluetooth (audio) devices. I can connect to them, but the connection immediately closes and i cannot connect again. Tested with 2 different audio devices. Any ideas? Then it would be perfect :-)