Problems with Samsung Galaxy Tab A 8.0

/e/OS Devices Samsung
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so you can use linux Galaxy-Flasher, the ultimate graphical tool for Samsung devices

or Revert Samsung Device to stock ROM on Windows PC

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I couldn’t answer yesterday, because the forum didn’t let me.

I was able to upgrade the boot loader version. I’m not sure though if that helped. I still can’t get into the recovery after flashing the recovery image. I don’t remember how many times I tried again, but it was a lot.

I tried different variant, as you described to go from the download mode to the recovery, but in the end it’s always the same. When I keep pressing power and volume up, I stay in a reboot loop and I see a warning about not running official Samsung software.

When I let go of the buttons I see an error screen “SECURITY CHECK FAIL : recovery.img” … “Security Error: This phone has been flashed with unauthorized software & is locked.”

… when I restore Samsung stock images and re-lock the OEM again, I see this:

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31881×3119 398 KB

I don’t know what to do anymore. I can’t go forward and I can’t go back. It feels as if I broke it …

P.S. I would have liked to add screenshots for the first 2 screens as well, but again … the forum doesn’t let me.

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In your regular Download mode screen do you see Prenormal ?

and / or do you see the exact phrase

Only official released binaries are allowed to be flashed(RECOVERY)

You might search this page Know your hardware - Samsung for those terms for clues to what this might mean.

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In your regular Download mode screen do you see Prenormal ?

no

and / or do you see the exact phrase Only official released binaries are allowed to be flashed(RECOVERY)

no

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Is the bootloader really unlocked ?

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Is the bootloader really unlocked ?

Right now: no. As I said, after all failed attempts to install eOS, I’ve put back all Samsung Stock images and relocked the bootloader, and it’s still broken.

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So i am not surprised that you cannot flash the custom recovery

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So i am not surprised that you cannot flash the custom recovery

Why? Sorry, but I feel like I repeat myself here.

It was unlocked, when I tried to install eOS. Otherwise I would get an error anyway during flashing the recovery image. I failed, again and again. Gave up. Then I tried to restore original Samsung software, locked the bootloader again, and the device will not even boot that anymore. That’s what the screenshot is showing. As soon as I start the device now, I get that screen.

Right now it’s not even about installing eOS anymore, but at least making it work with Samsung stuff again. And I am failing at that, too …

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Downgrading from T290XXS 5 CWG5 to T290XXU 3 CVG3 is not possible because of the revision bit

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I’m confused again. Where is T290XXS 5 CWG5 now coming from?

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I suppose it was the version previously installed as it is the latest firmware for this device

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I suppose it was the version previously installed as it is the latest firmware for this device

no, it wasn’t

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from Install LineageOS on gtowifi | LineageOS Wiki we get :
connect the device to a Wi-Fi network.

Pre-Install Instructions

warning

Warning: The following instructions will unlock the bootloader and wipe all userdata on the device.

  1. Connect the device to a Wi-Fi network.
  2. Enable Developer Options by pressing the “Build Number” option at least 7 times, in the “Settings” app within the “About” menu
  • From within the Developer options menu, enable OEM unlock.
  1. Download this package.

4.warning*

5.Warning:* If you skip this step, you will not be able to boot any custom image!

  1. Power off the device, and boot it into download mode:
  • With the device powered off, plug in the device while holding Volume up + Volume Down + Power.
  • Now, click the button that the onscreen instructions correlate to “Device unlock mode” and/or “Unlock Bootloader”.
  • Device will restart, repeat steps 1 and 2 to enable the Developer Options menu again.
  • Verify that “OEM Unlock” is still enabled and continue to step 5
  1. Download and install the necessary drivers.
  • Download the newest Samsung drivers from here.
  • Install SAMSUNG_USB_Driver_for_Mobile_Phones.exe.
  1. Download this version of Odin.
  2. Extract “Odin_3.13.1.zip”.
  3. Run Odin3 v3.13.1 found in the newly extracted “Odin_3.13.1” folder.
  4. Check the box labeled next to the button labeled “BL”, and then click the “BL” button.
  • In the menu that pops up, select the previously downloaded package .tar file.
  1. Power off the device, and again boot it into download mode:
  • With the device powered off, plug in the device while holding Volume up + Volume Down + Power.
  1. Check in the top left of the Odin window that you see a valid device, it will show up as something like COM0.

14.check*

15.Tip:* The COM port, or the number succeeding COM, may be any valid number.

  1. Click “Start”. A transfer bar will appear on the device showing the package being flashed.
  2. Your device will reboot, you may now unplug the USB cable from your device.
  • After this step, your bootloader version will display as T290XXS3ATF1. This is a part of the bootloader unlock process.

18.warning*

19.Warning:* If, on this step, your device is stuck on a black screen, your device’s bootloader is not unlockable and you cannot continue with these instructions. To return to the stock ROM, boot to Download mode and flash the BL package here.

  1. The device will demand you factory reset, please follow the onscreen instructions to do so.
  2. Run through Android Setup skipping everything you can, then connect the device to a Wi-Fi network.
  3. Re-enable Development settings by clicking the “Build Number” option 10 times, in the “Settings” app within the “About” menu, and verify that “OEM Unlock” is still enabled in the “Developer options” menu.
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