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[rom] [twrp] sm-t290 & sm-t295 [discussions & help thread]

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J.Michael

Senior Member
Jan 20, 2018
738
550
Samsung Galaxy Tab A series
Hi, cannot recall trying that only but will give it a go...I assume with booltloader unlocked...?
Yes, bootloader unlocked, with all the checking Wu describes in his Install Notes.

As I understand, with bootloader locked you might be able to flash a full, stock firmware. Anything else requires unlocking bootloader first, and putting up with the nag screen.

I would think being able to flash something that doesn't work right (won't boot; boots funny) would prove that the bootloader is unlocked, but it's possible you can always flash, and they really mean "bootloader unlocked" and it's only the loader that was ever locked, the "flasher" was always unlocked. But that's not the way people talk about it behaving.
 

aharonshor

Member
Aug 29, 2016
16
7
Everything is black, you can only get the screen back is flashing again the stock factory rom which came with the tablet, actually to flash you need to memorize how to do it, press volume up and down no screen, and then press up, no screen, and then Odin, from start to finish only black screen, after successful stock original rom you see anything
I tried to work on many new T295 devices from manufactor,
And I can say that not only with custom things it makes a black screen,
But also as soon as you flash something of the original Android 9 in particular the BL of the Android 9 that is needed to flash all the other things, the screen immediately turns black.
 

Talich52

Senior Member
Dec 24, 2010
323
137
Download link to twrp on page 1 is 404!
Can we get a new one?
For which model is the T290 or T295?
Here for the T290:

Here for the T295:
 

emtee_skull

Senior Member
May 6, 2011
272
79
Sorry. I need help. I have a t290 that I have soft bricked(?) The display has went blank. The back light comes on. It vibrates. I have adb control. I can tell when its in recovery compared to download mode by seeing com connection in odin as 0:[COM9] or 0:[COM11] respectively.

Any ideas from more experienced folk? Thank you.
 
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J.Michael

Senior Member
Jan 20, 2018
738
550
Samsung Galaxy Tab A series
Sorry. I need help. I have a t290 that I have soft bricked(?) The display has went blank. The back light comes on. It vibrates. I have adb control. I can tell when its in recovery compared to download mode by seeing com connection in odin as 0:[COM9] or 0:[COM11] respectively.

Any ideas from more experienced folk? Thank you.
I'm curious what you did, but to recover from anything you should be able to flash the stock ROM with Odin.

If the problem is from installing Magisk, or having Magisk installed, maybe you have a bad module. That will go away if you wipe data. If you're trying to recover without wiping, someone else will have to chime in.
 

emtee_skull

Senior Member
May 6, 2011
272
79
Thank you for your reply. I am unsure too. After unlocking the bootloader and trying to install twrp I lost the screen. I have no GUI of anything with the tablet. I can see the backlight on. The tablet vibrates.

Edit: it also seems to boot up into the custom rom. But just blank display. See attached video.

I pulled the build.prop and custom rom seems installed. Is there a security issue keeping the display off?
ro.modversion=OmniROM-9-20210515-gtowifi-HOMEMADE
 

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Viggen66

Senior Member
Mar 22, 2009
683
72
Thank you for your reply. I am unsure too. After unlocking the bootloader and trying to install twrp I lost the screen. I have no GUI of anything with the tablet. I can see the backlight on. The tablet vibrates.

Edit: it also seems to boot up into the custom rom. But just blank display. See attached video.

I pulled the build.prop and custom rom seems installed. Is there a security issue keeping the display off?
ro.modversion=OmniROM-9-20210515-gtowifi-HOMEMADE
Same crap happened to me no screen, and damn Samsung after this has locked my oem, so can't even unlock bootloader, really a full potential tablet waisted on stupid Samsung security policies, hey the tablet is mine I can do whatever I want to it, not a company deciding what I can do
 

J.Michael

Senior Member
Jan 20, 2018
738
550
Samsung Galaxy Tab A series
Thank you for your reply. I am unsure too. After unlocking the bootloader and trying to install twrp I lost the screen. I have no GUI of anything with the tablet. I can see the backlight on. The tablet vibrates.

Edit: it also seems to boot up into the custom rom. But just blank display. See attached video.

I pulled the build.prop and custom rom seems installed. Is there a security issue keeping the display off?
ro.modversion=OmniROM-9-20210515-gtowifi-HOMEMADE
Which files did you have in Odin when you were installing TWRP?

Have you tried burning the stock ROM?
 

Talich52

Senior Member
Dec 24, 2010
323
137
Is there any way to downgrade to U3 bootloader?? From U4.... Root cant be obtained in U4....
Google and Samsung respectively forbid downgrading the bootloader version, so you can't go back to U3 from U4 .You cannot modify the bootloader file,as it is digitally signed by Samsung...
I am currently on the T295XXU4BUD4 firmware and have Root rights.This is possible, since I updated the firmware via ODIN,but used the bootloader from android 9 ;)
Post in thread 'SM-T295 - Finally rooted tablet!! (updated 19-March-2021)' https://forum.xda-developers.com/t/...t-updated-19-march-2021.4050329/post-85143483
 
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Google and Samsung respectively forbid downgrading the bootloader version, so you can't go back to U3 from U4 .You cannot modify the bootloader file,as it is digitally signed by Samsung...
I am currently on the T295XXU4BUD4 firmware and have Root rights.This is possible, since I updated the firmware via ODIN,but used the bootloader from android 9 ;)
Post in thread 'SM-T295 - Finally rooted tablet!! (updated 19-March-2021)' https://forum.xda-developers.com/t/...t-updated-19-march-2021.4050329/post-85143483
Sir is this totally impossible in U4 to get root access......many of us didn't know about this earlier....now we are stuck.....is there any possible way to get root access?? Even in future?? Or this is the end? Are we hopless?? Please answer sir
 

Talich52

Senior Member
Dec 24, 2010
323
137
Sir is this totally impossible in U4 to get root access......many of us didn't know about this earlier....now we are stuck.....is there any possible way to get root access?? Even in future?? Or this is the end? Are we hopless?? Please answer sir
I cannot answer this question, since not a programmer, but only a user. With a lot of experience, but only a user ...;)
Serious people do not want to deal with our device, and the general methods of rooting Magisk do not work :(
 
I cannot answer this question, since not a programmer, but only a user. With a lot of experience, but only a user ...;)
Serious people do not want to deal with our device, and the general methods of rooting Magisk do not work :(
Sir plz keep trying....i dont see any other hope for Our T295 without few of u people....with your experience you guys might come up with a solution,plz dont let us down😭😭😭
 

FilipoMoake

Member
Jan 28, 2011
6
0
I recommend the following actions:
1) flash full firmware 10 android, that is, all 4 parts.
The device should start up normally.
2) Lock the bootloader - this is done in the same way as unlocking, but in the reverse order.
3) flash 9 android, parts BL, AP, CP, CSC (not HOME_CSC), that is, with data reset, otherwise rollback is impossible.
4) if the device starts successfully, then unlock the bootloader.
5) flash 10 android, but no BL file

P.S. If the bootloader was unlocked on Android 9, then it will remain unlocked on Android 10 ...
My second device T295 has a production date of 10/10/2020 and I don't see any such problems ...

Are these recommended actions confirmed to work ?
 

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    I too have this same black screen problem. I just recently posted over on the TWRP 3.5.1 thread here. How I got into this mess is that I tried flashing the TWRP v3.5.1 to my brand new Costco (link) SM-T290NZKCXAR using Odin3 vs 3.14.4 by checking the AP box and putting the TWRP v3.5.1 in the original top post in text area. When it finished successfully, my screen turned on (backlight illuminated) but black and vibrates when touched. If I turn it off by holding the power button, it turns on again to this same state. Odin v 3.14.4 seems to recognize it as COM 1 sometimes (and when it does, Windows shows it as a device in the device manager). When I attempt to hold the power, vol up and vol down buttons to reboot into download mode (perahps im not doing it correctly) it will "reboot" into the same black screen/illuminated background state but without Windows or Odin detecting it. If it helps my serial number begins with R9 and I just bought it from Costco yesterday ($111 with tax / on sale for $99) Any thoughts or ideas appreciated and happy to answer questions or provide more details. thx in advance!
    Turn off tablet.
    Connect usb cable to PC, but NOT to tablet.
    Press vol up + vol dn keys and hold them down.
    Insert usb cable into table while holding down keys.
    You should see a screen with text on it. Release keys.
    Follow directions on screen.
    2
    Is a TWRP root version of this being worked on? Having TWRP would be great as it provides a lot of great features.

    I was able to root my SM-T290 using Magisk Manager and a collection of random instructions from different parts of the internet.

    The purpose of rooting my device was to operate Kali Nethunter and its modules in which root access is needed.

    I wanted to provide the steps I took to root my device. Disclaimer: PROCEED AT YOUR OWN RISK! I AM NOT RESPONSIBLE IF YOU BRICK YOUR DEVICE OR DONT KNOW HOW TO RECOVER FROM A SOFT BRICK.
    I do not take credit for this, I am simply aggregating what I found during my experience of trying to root my device.

    Furthermore, at the time of writing, doing all the steps will have your ctsProfile set to false, which I believe means you can't do certain banking functions, etc. I've tried numerous guides online to attempt to fix it, but none have worked. They all just unroot the device and I have to do a quick root with Odin since I saved the files from all the steps.

    Needed Items:
    • Cable to connect SM-T290 to PC
    • microSD card
    • Ability to connect microSD card to a PC
    • Paperclip or pinhole stick to open slot on SM-T290
    • Linux (VM is not needed if you don't have one. You can use the Windows Linux Subsystem & obtain Ubtunu from Microsoft Store)
    • Stock Firmware

    DRIVERS

    Install the drivers for your device on your computer. You can google this or connect it to the computer and let it install them on its own.

    UNLOCK BOOTLOADER & USB DEBUGGING

    Before you can do this, you need to enable developer options.

    1) Go to Settings
    2) Go to About tablet
    3) Go to Software Information
    4) Click on Build Number repeatedly. You will see a message at the bottom saying X amounts of taps remaining to enable it
    5) Go back to Settings
    6) At the bottom, you'll see Developer options, click it
    7) Locate OEM Unlocking and enable it. Accept the warning is given, if it is shown
    8) Scroll down and locate USB debugging and enable it

    You've now enabled OEM Unlock & USB debugging.

    9) Turn off the device.
    10) Connect the USB cable to the computer. Do not connect it to the device yet
    11) Press and hold the Up & Down volume buttons at the same time
    12) While holding them down, connect the other end of the USB cable to the device
    13) A warning screen should show up prompting about the risk of unlocking the bootloader
    14) Press and hold (Long Press) the Up Volume button

    Your bootloader should now be unlocked. You can confirm if this is the case as every time you boot the device, you'll receive a bootloader warning.

    Download Stock Firmware

    You need a copy of your stock firmware. First, you need to look up what version you are using.

    1) Go to Settings
    2) Go to About tablet
    3) Go to Software information
    4) Find Build Number and write down the portion after the bulk of numbers, ie. T290XXS3ATC2
    5) Go to <I can't enter a URL since I don't have 10+ posts>. Google SFirmware Samsung SM-T290 (I do not own this site nor do I know how the firmware is obtained. Due to this, I don't store anything personal on the rooted tablet)
    6) Find the build number matching your tablet and its country
    7) Download the files to your computer

    File Modification Needed Towards Root

    1) Unzip the file downloaded
    2) On your Linux VM or Linux Sub-Windows System, go to the folder where the extracted files are at
    3) Find the AP*.tar.md5 file
    4) Extract its contents using the following command: tar -xvf <filename>
    5) Decompress the following files from the extracted AP tar file: boot.img.lz4, recovery.img.lz4, and vbmeta.img.lz4, using the following command: unlz4 <files>
    6) Add the newly decompressed files from the last step into a new tar file, using the following command: tar -cvf pre-processed.tar <files>
    7) Copy the newly created tar file named pre-processed.tar onto a microSD card
    8) Insert the microSD card into the tablet
    9) Using Files, copy pre-processed.tar from the microSD card to the Downloads folder on the Internal Storage. (This step may be optional, but I did this anyway).
    10) Install Magisk Manager on the tablet. The software can be found here: <I can't enter a URL since I don't have 10+ posts> Google Magisk Manager
    11) Open Magisk Manager
    12) You will see it says Magisk is not installed, to the right there is an Install button, click it.
    13) You will be prompted if you want to install it now, click Install.
    14) Navigate to the pre-processed.tar file in Downloads and let it do its thing.
    15) It will process and say it generated a new file, which can be found in the Downloads folder called something like magisk-patched.rar
    16) Copy that file back to the microSD card
    17) Copy that file to your computer
    18) Extract its contents using the following command: tar -xvf post-processed.tar
    19) Go into the new directory containing the extracted content and be sure to add post_ in front of each file there
    20) Copy the files to the AP folder which you created the pre-processed.tar files from.
    21) For post_boot.img and post_recovery.img (not post_vbmeta.img), perform the following command in Linux for each:
    Code:
    dd conv=notrunc if=<POST_PROCESSED_EXTRACTED_*.img_FILE> of=<PRE_PROCESSED_EXTRACTED_*.img_FILE>
    22) Delete the post_boot.img file to prevent any confusion
    23) Delete the post_recovery.img file to prevent any confusion
    24) Delete the vbmeta.img (original) file. Find post_vbmeta.img and rename to vbmeta.img
    25) Create new AP tar file with all original extracted files in the AP folder, except replace the following:
    Code:
    boot.img.lz4 -> boot.img (of= file from last step)
    recovery.img.lz4 -> recovery.img (of= file from last step)
    vbmeta.img.lz4 -> vbmeta.img (from post-processed.tar generated by Magisk)

    Remember the command to create a .tar file is tar -cvf AP-Patched.tar <files>

    Odin & Root

    1) Download Odin if you don't have it already have it from <I can't enter a URL since I don't have 10+ posts> Google Odin3
    2) Boot your tablet into download mode. (Device Powered Off -> Power + Up Volume -> Recovery Mode -> Download Mode)
    3) Connect your tablet to your computer
    4) Open Odin and load the files one by one from the downloaded stock firmware. The only difference should be the AP file which should be the newly created AP-Patched.tar file.
    5) Start it & let Odin do its thing.
    6) Once it's done and the device has restarted, you can check Magisk Manager.
    7) If you see Magisk is up to date with a checkmark, congratulations, you now have root access.

    Hope this helps folks out as I spent about 2-3 days trying to figure everything out.
    2
    I see people still trying to patch files to get root. If you flash the TWRP posted by @Talich52, with reboot unchecked you can install Magisk from TWRP. To get into TWRP successfully (I have tested this multiple times), press vol dn + pwr keys. When screen goes blank, press vol up + pwr keys. Keep holding keys after reboot. Tablet will reboot again. When Samsung logo appears stop pressing pwr key. When bootloader msg appears, release vol up key, quickly press & release pwr key, and quickly press vol up key until in TWRP. You will then format (NOT WIPE) data. Install Fix_vendor_9.0.zip or Fix_vendor_10.0.zip. Clear dalvik and cache. Reboot back into recovery. Install magisk. reboot system. have fun.
    2
    Could you provide me with the latest stock recovery?

    Here is my stock recovery from XXU2ASL3.
    Am downloading SL3. (DOWNLOADED)
    2
    I also need boot.img.lz4 and vbmeta.img.lz4
    Thanks.

    Thanks!
    See attached files.