yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
OK next hurdle : I have definitely achieved OEM unlock / unlock bootloader., and started the next steps..

I have installed Odin"3B PatcheD/ModdeD v 3.14.1." and followed instruction step 1/2/3/4/5/6 i.e.

> the BL bootloader file ( presumably in box BL to be ticked )

> the AP TWRP 'tar' file via the AP slot.

But here I am now stuck , for a few reasons possibly

- During a re-boot I keep getting the new frequent annoying Samsung warning message about the fact the device has an unlocked bootloader which interferes things.

- I don't quite have the dexterity to follow the confusing sequence of button pressing

- I'm stuggling to visualise what view/image I should be seeing as all the button pressing is occurring...in other words....the words are in not enough, I need to visually see the sequential events.

Is anyone able to look at these instructions beyond step #5 and either find a YT vid link or illustrate with pics of what I should be seeing.

EG I've I now experienced four different boot screens.

1. The Blue screen achieved by pressing vol up + vol down then plugging in a USB feed

2. The boot screen achieved by pressing vol up + pwr. Is this 'recovery' ?

3. The screen displayed when via opting for 'reboot to bootloader' on previous screen. So is this 'bootloader' or 'download'

4. An options screen overlaid onto the unlocked bootloader warning, I stumbled upon this when trying to follow the complex sequence of button pressing and can't even recall how I got this.

... so when I read 'in download mode' and 'in TWRP' , as a greenhorn I need assistance to join the dots. What do these look like?

Beyond this , I see 'Install Fix_vendor_10.0.zip' and 'Install magisk'. Yes I've downloaded the files to my PC...but I need further explanation on what method/means I use to install.

These instructions are aimed at regular device modders, not occasional passers by. I've attached the images I've described and would greatly appreciate some assistance.

Thanks

EDIT : I've stumbled further forward into accessing this TWRP thing and changed ment from Russian? to English.

I've installed the 'Fix Vendor 10" and cleared cache. Now I'm on step #15 which says "You will then format (NOT WIPE) data." OK so there are no options on this TWRP menu to format...only 'WIPE'. So what needs to be done to 'Format' per step #15 ??

EDIT 2: Regardless of the step #15 I carried on andTWRP installed the final 'Magisk' file and let it auto reboot.

So for better or for worse, it autobooted and when I checked via 'Rootchecker app...and...yey I gpt root!!

Mote screen pics added in case they help others down the line.

Next for me is finding the best 'go-to' rom to install :-)
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
You could try the latest LineageOS GSI rom from here, if you want. I recommend you download the 'Treble Info' app from Google Play, and check there whether it is supported. Also look at the section which rom you are going to need for the device.
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
Thanks Minionguy, I've just looked on 'Treble Info' app and it tells me 'Generic System Image Found!' and confirms my device supports , image is "system-arm64-ab.img,xz".

I see an option to browse images. Do I continue to action from this app...or via the link you gave ? My device is presently stock Android 10, what version can it reach with 'lastest LineageOS GSI" ?

Thanks
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
@ebod The nag screen is an unfortunate fact of life with Samsung. In spite of it telling you to press the power button, you can just wait and it eventually goes away. I agree, it is an especial nuisance when struggling to boot to Magisk-in-recovery.

The screen that says "Android recovery" at the top is recovery.

The screen that says "download mode" at the bottom of 8 lines is download mode.

That funny overwriting menu is something I have triggered. I also cannot get it consistently. From the options, I assume it is a backup (secondary; fallback; reserve; emergency) recovery mode. I do not think it is any more capable than the normal recovery mode.

Bottom line: You got it to work. Mazel tov! Now stop poking it before you break something. And never let anything update.
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
haha yep thanks. This Tab A is destined to be a car mounted unit in an old 2008 Volvo C70.

( to illustrate..see this YT vid

)

I just knew that a rooted device makes a lot of the complexities of auto-start/auto-stop etc etc possible.

I'm also a newbie to the 'Tasker app' world, but that is key to making the device behave like a head unit and run seamlessly. So I'll hang around to see if a better custom rom is worth installing before I move forward to setting up Tasker on it. I want a fast autoboot on sensing usb power, so that 'nag screen' is a hindrance I'd prefer to do without..

opps finally one more thing .. When you say 'never let anything update' should I literally switch off the software update option' within settings>Software update? Anything else?
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
Yes, I meant turn off every automatic update option you can turn off. And set the wi-fi (if any) to "metered" to discourage the ones you can't turn off.

As for the nag screen: my car came with a screen, and every time it comes on there's a warning that staring at the screen while driving could be hazardous to someone's life. I just grit my teeth and wait for it to go away. Kind of like I grind my teeth from the time it starts playing whatever it's playing to the time the controls become active, so I can mute the damned thing before I start the car.

Given how long it takes the tablet to boot, the nag screen is really nothing.
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
You could use any of those versions:

LineageOS 20 is Android 13, LineageOS 19 is Android 12.1, LineageOS 18 is Android 12 and so on (I thought). The latest is version 20 for Android 13. If you want to install this one, you have a few options:

And this is for the filenames to get the good one for your device:
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
OK Many thanks Minionguy, yes if its stable I will be happy to go lineage 20. I am UK based so please can you steer me to a suitable safe/stable file, and then what is the method to install (ODIN or via this TWRP boot screen)?? Forgive me whilst I have done this kind of thing before...it was many many years ago back on devices like Galaxy S3. Since then I have had LG/Huawei/OPPO and never had the need/desire to tinker with devices in 8<>10yrs
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
It should be flashed as a zip in TWRP. I recommend you this one. It has Google apps, but not superuser. I recommend you install superuser later on via TWRP and then Magisk.
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
Right I'm on it , step 1 new rom via TWRP, step 2 will be SU ( link to appropriate file would be greatly appreciated ). Just regarding this 'mgkisk' file, I thought I already installed this as part of the root steps? or do you mean I need to 're-install' after the new rom is added?

Finally will this new lineage 20 rom stop any kind of Samsung auto-update which could wipe out all the mods? Or will I have to force / switch off any auto-update settings?

Thanks again :-)
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
You will need to reinstall root, will link the file later. I think that because you use a different rom, you do not need to worry about that.
[Samsung Galaxy Tab A series Guides, News, & Discus] bingo1951:
Per 295XXU4CVG3 android 11 ??? GRAZIE
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
On this firmware, Root rights cannot be obtained, nor can TWRP be installed. We need a bootloader from Android 9, and it is 3 versions, rollback (downgrading) of the bootloader is prohibited ... :(

P.S. by the way, there is an update to firmware like T295XXS5CWA1 with version 5 of the bootloader...
[Samsung Galaxy Tab A series Guides, News, & Discus] bingo1951:
Grazie
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
Hi All, After several unsuccessful attempts to flash a new rom, I'm presently back to a rooted stock rom again. Tonight things went south when I tried to update the Magisk file that came as part of this tutorial. Are there any do's & don'ts associated with updating this app? eg what again the option regarding boot? I think I took it and all bombed out :-/
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
What tutorial?

I wouldn't update Magisk. Or the Android.

If you want to update, lots of people have success by letting the Magisk manager app perform the update. I have lost track of the different versions of Magisk, and which can update to which. Another approach would be to start over: Whatever you did originally, do it again, but use a newer Magisk manager app apk to do the patching. Nothing changes in Odin. It might not be necessary to do all the wiping and reformatting. If you want to try to preserve your data, make sure you use the CSC file that does not force a wipe. (I think it's HOME_CSC.tar that does *not* force a wipe, but you should really find at least one other source that says the same.)
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
The tutorial I meant was this original post or in particular the update thread that was linked from it. I only downloaded the Magisk file from the attachments there, and my screenshot shows what apparently is the latest.

But to be honest, I'm just beginning to conclude its more trouble than is worth trying to update to a newer rom. There is literally too much conflicting information to make sense of , and nobody so far has been able to give me a proven safe method to get me there.

I have Android 10 stock with root, root was my single biggest priority. If you say "I would update Magisk" then I probably just uninstall the app as its pointless being there.

My next priority is to try find out how to dump the stupid Samsung bootlock warning message as basically I need this SM-T295 to just quickly startup on sensing usb power ( is that called fastboot? )
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
You do not have the latest version of Magisk. You might have the same version I used four years ago.

But I said "I would *not* update Magisk".

If that's what you meant to say just before you said "probably just uninstall the app as its pointless being there" -- that's a matter of taste: Magisk has other functions, the manager is of some use, but it's trivial to reinstall it when you think you want it. I don't think the app is involved in granting setuser privilege -- but it might be involved in clearing the flag if you inadvertently deny privilege to an app.

A lot of people hate the nag screen. I don't think anyone has been able to eliminate it. You do not have to respond to it, just wait and it goes away.

"fastboot" is a program like "adb" -- it runs on a PC and communicates with a device. It can only be used with a device that supports it. Samsung does not support fastboot -- that's why we have to use Odin.
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
Oh man, just download the latest version from here: https://github.com/topjohnwu/Magisk

The latest version is v25.2
[Samsung Galaxy Tab A series Guides, News, & Discus] Kurukuwa:
hello guys, is there any twrp on T295XXS5CWA1 android 11
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
https://xdaforums.com/t/sm-t295-root-tab-a.3969949/post-87253041
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
I'm a bit burned out getting root and then loosing it after trying to update things such as Magisk, then having to start all over again. So I'm just settling with a rooted stock rom as I can't get a dumbed down enough support that gives me confidence to.

Prime focus now is i) getting the device to start up on receiving usb power and ii) although I appreciate its just a warning that times out...I want to drop the Samsung bootlock warning as it just slows startup when the device gets mounted as a piggyback head unit in my Volvo.

I managed to get an old stock rom / non-root LG H850 to fire up on usb power, just need help to do the same for an SM-T295..
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
So, I've found some steps:

1. Download the firmware for your SM-T295.

2. Download the 7-Zip version from here. NOT THE NORMAL VERSION, as that one has not support for .tar files...

3. Open the BL file from the firmware package using the newly, custom version of 7-Zip.

4. Extract the ``up_param.bin.lz4`` file from the BL file.

5. And then extract the new ``up_param.bin.lz4`` file.

6. And then extract the ``up_param.bin`` file from the new ``up_param.bin.lz4`` folder

7. Open the ``up_param.bin`` file and delete the ``boot_warning.jpg`` and ``svg_orange.jpg`` if they exist.

8. Then right click the ``up_param.bin`` file and select 'Add to archive' from 7-Zip menu.

9. Now create an archive from the file with the format ``tar``.

10. Flash the ``up_param.tar`` file with Odin as BL file.
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
1. I have already got firmware as part of recovering from a failed GSI install. I'm on the samfw.com version T295XXU3BTI4 with the appropriate set of AP/BL/CP/CSC tar.md5 files

2. ???? here we go again! Unclear to a newbie, just a link to a page littered with download links. Haven't got a clue where to go / what I should be downloading :-/
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
Clicking the blue 'here' which will open the download link of the custom 7-Zip program. I think you need to download the '7z22.01-zstd-x64.exe' asset, because I think your computer is 64-bit (most modern computers are).
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
OK lets see where this one takes me :-)

i) I thought as part of rooting, I replaced a stock tar.md5 file with a new one to get TWRP installed. There's no scenario here of me editing a stock file and then busting the device again due to what was modded for TWRP??

ii) only for info on the other task of auto booting on power/dock , I've found this to pursue, don't know what you to do with it but it shows it can be done : https://xdaforums.com/t/q-power-on-when-plugged-in-boot-when-docked.1187631/
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
Wait, I don't really understand your first part, but I do understand the second one. I guess you want the tablet to boot up when you start your car, and that is possible by editing the file at '/system/bin/playlpm':

#!/system/bin/sh
/system/bin/reboot

I guess that it's the same as told in the thread you listed to me. You can do this by installing a root explorer app or using TWRP.

Also be sure to set the permission of this file to '0755'. Well, let's say this:
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
Oh well, checked BL file via this new 7ZIP and no sign of a "up_param" file :-/
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
Oh yeah, I had the exact same problem. Let me check a bit further to find a fix.
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
Look at this 2 threads:

1. https://xdaforums.com/t/get-param-bin-file-samsung.3782066/ (FIRST)

2. https://xdaforums.com/t/guide-how-to-find-param-partition-block-samsung.3906650/ (Look at this one when told in first one)

You can try to extract the param file using this method. These commands can be run from the terminal in TWRP.
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
I understand getting a pc command prompt but not 100% sure what 'state' the device must be in when connected to the PC. i.e. must it be in download mode or TWRP ? or just standard active running mode? Do you just suggest abandoning the pc access and try via TWRP alone ?
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
I think you are wasting your time trying to eliminate the nag screen before you address the real issue.

Getting the tablet to automatically boot when power is applied is going to involve manipulating the filesystem. I don't think you're going to be able to just remount /system and edit something. That thread @Minionguyjpro found talks about unpacking the boot image and modifying it's ramdisk and repacking the boot image. That's a lot of steps where something can go wrong.

If you decide to live with having to push a button to boot the tablet, you will probably find that waiting for the nag screen to time-out is not such a big deal.

And it probably takes a lot of work to make the tablet shut down when you turn off the car. So, unless you go a long time without using the car, the tablet is already booted. At worst, you need to get past the lock screen. I haven't seen anyone talk about that. Maybe you just disable it in Android Settings.
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
And that, and it goes automatically further, even though no one presses it.
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
It can be either in TWRP or in the normal mode, as long as ADB/USB debugging is enabled, I think.
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
tried both and no success either way, I selected a Samsung as a car based tablet because I genuinely thought it would be the most supported device brand to configure. Seriously concluding why do I bother as nothing is straighforward. It would less stress just listening to crackly FM radio as can't see me getting this device to behave like a car head unit. I've successfully got a stock LG G5 phone running as a car based unit that switches on/off etc without my input. Only problem with that is its too small screen'wise

Like they have Apple stores in all major cities, kinda wish I could take in this tablet to a Samsung store and get an in-store expert make it car friendly :-/
[Samsung Galaxy Tab A series Guides, News, & Discus] tamtc84:
I upgrade A8 T295 from T295XXS3ATB2_T295OLM3ATB2_XEV_9.0 to T295XXS5CWA1 by Odin. Success to upgrade.

When i want to rollback to T295XXS3ATB2, i received message: "sw rev check fail fused 5 binary 3".

How do I do to rollback to T295XXS3ATB2? or setup T295XXS3ATB2 again to root with Magisk?

Many thank.
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
You don't. Not without more control than anyone we know has. They don't want you to be able to roll back. They seem to have done a good enough job, you cannot roll back.
[Samsung Galaxy Tab A series Guides, News, & Discus] tamtc84:
Can i use another combination firmware to reset fused. After that flash again with T292XXS3ATB2?
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
Still no. Just throwing their software against their gatekeeper is not going to bypass their "protection".

Where did you get "sw rev check fail"?

If in download mode, when you used Odin, and you could then boot to Android, then they didn't even let you write the unapproved software. You would need some secret super-Odin, or you would need to open the box and place probes in the right place to rewrite PROM, to force your choice of software back onto the device.

If you get the failure when trying to boot Android, and you have to use Odin to restore the approved bootloader, and you are able to use Odin to restore the approved bootloader, and then you can boot, then there is a software solution. But you would probably have to crack their signing protocol to create a bootloader that claims to be the right revision, and yet allows you to do what you want. I think you could solve the challenge of burning a PROM more easily than you could crack Samsung's encryption.
[Samsung Galaxy Tab A series Guides, News, & Discus] tamtc84:
In download mode, when i use Odin with S3 rom, i received "sw rev check fail fused 5 binary 3".

I will research more.

Many thank you.
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
You should be able to downgrade your firmware, but it requires wipe of a few things. Actually l, I heard from multiple sources it was possible.
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
What exactly goes wrong at the installation of the auto boot part? Let's include a screenshot where possible, and some text???
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
We'll get atleast a few things to work, I'm very sure about that.
[Samsung Galaxy Tab A series Guides, News, & Discus] tamtc84:
Please tell me how to do it.

Current, i still search to do it but it still error.
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
You could try to flash the latest TWRP if it works and then try to flash the firmware. By the way, it may not be possible to downgrade, but you may be able to downgrade to another firmware with the same binary version? And also, why are you downgrading?
[Samsung Galaxy Tab A series Guides, News, & Discus] Talich52:
Do not torment the device and do not suffer yourself - Google & Samsung forbade downgrading the bootloader version, that is, with version 4 or 5, do not install version 3. In addition, bootloaders 4 and 5, even unlocked, do not allow you to install any custom files, such as a patched kernel or recovery TWRP. All questions to Samsung, but support for the device is over by the manufacturer...
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
I feel I've got further with a stock non-root LG G5 than I'll ever get with this SM-T295. That device literally starts on demand ( no bootlock warnings ) and auto shutdowns ( with help from Tasker /Autoinput ). I was just expecting once I got this unit rooted, it would be all just plain sailing. Its been anything but...

I have root, and I have the Magisk app on my device asking to let it update itself. However last time I tried it bombed out and I had to go back to square one.

I'll live with a stock Android 10 rom, in reality the device will just spend most of its life running Vivid launcher. So I just want to achieve a non-intervention turnkey startup in usb power as fast as is practical...preferably without the bootlock warning. I hoped this was a simple request that ANY novice could follow given clear enough instruction, but so far its been a combination of me being too dumb and nobody giving me a straightforward enough path to follow..
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
I once saw a flashable TWRP zip, but I should not flash it as some people bricked their device with it, I thought.
[Samsung Galaxy Tab A series Guides, News, & Discus] Minionguyjpro:
You could try to take a look at this:

https://xdaforums.com/t/how-to-remove-carrier-boot-logo.4375593/
[Samsung Galaxy Tab A series Guides, News, & Discus] ebod:
I do have TWRP on the device. Though its pain to get to it with the nonsense bootlock warning message getting in the way lol.
[Samsung Galaxy Tab A series Guides, News, & Discus] Nurhelmi:
I try flash in odin and fail..
[Samsung Galaxy Tab A series Guides, News, & Discus] KRAZZIEBOY:
copied the modded code to existing code or delete existing code? if just copy where you copied at the start and at the end?
[Samsung Galaxy Tab A series Guides, News, & Discus] gcrutchr:
Of course you paste from the beginning of the file!!
[Samsung Galaxy Tab A series Guides, News, & Discus] J.Michael:
Magisk replaces original-image with patched-image. patched-image is shorter than original-image. Copy original-image to patched-and-padded-image. Then, overwrite the beginning of patched-and-padded-image with patched-image. Use something like "dd" with conv=notrunc, which will copy what there is of the source file, without erasing the extra of the destination file.
[Samsung Galaxy Tab A series Guides, News, & Discus] KRAZZIEBOY:
ok what is the exact procedure to boot into recovery after flashing files?
[Samsung Galaxy Tab A series Guides, News, & Discus] gcrutchr:
Recovery: vol up + pwr key => when see logo release power key