I solved a couple of what I thought were bricked tablets just be removing the battery cable and leaving it out for 5 minutes. As long as the CPU/SoC gets power, it may be in a "funny" state. Even when the tablet is "powered off", it's not because it's always listening and waiting to react to the power button. Only a complete removal of the battery for a few minutes will the CPU/SoC be truly off.
I'm afraid your only option is some sort of riff box or jtag programmer. You might want to try and contact your local makerspace or electronics group to see if anyone has such a tool. Check out the local universities or colleges?
i am not sure, thought this device is Exynos chipset (although someone posted about Qualcomm). you can unbrick in (EDL) emergency download mode if you manage to short-circuit test points on PCB. that requires Qualcomm HS-USB QDLoader 9008 Driver, QFIL and proper Samsung signed factory loader (firehose programmer)
As of this writing on Feb 7, 2021, there has been 18 downloads of the T350XXU1BPI2_bootloader_only. tar.How to flash stock bootloader with Odin
To flash just a bootloader with Odin:
I've attached a zip file containing T350XXU1BPI2_bootloader_only. tar and a README.txt file with explanation and instructions. T350XXU1BPI2 is the bootloader that's been shown to turn on the display panel.
- Extract the aboot.mbn file from the .tar.md5 ROM package, and (using something like 7-zip) create a .tar archive containing just that file.
- Boot the T350 to Download mode and connect it to your PC with USB cable.
- On the PC, run Odin. Click the "BP" button and navigate to the tar file you just created. Click Start.
- Odin should flash the aboot.mbn and report "All threads completed (succeed: 1 / failed: 0)".
- Reboot the T350.
The mainboard must have been physically damaged somehow, but flashing anything should not actually be able to do that kind of damage. These boards have a lot of protection built in, and in any case the process of flashing doesn't generate power conditions that the hardware can't handle.
Does it mess up to the extent that a JTAG box can't do anything with it? I thought that would imply hardware damage ...
The Octoplus JTAG box - the type used on this particular device by the service centre the OP took it to - claims it can flash/decode/repair a wide range of LG and Samsung devices, including these Galaxy tab models. The service centre tech said that box couldn't get anything from it, and that the only option was mainboard replacement. If that advice was correct, I do not see how this could have been caused by flashing aboot.don't know what JTAG box is or how this can even work over usb. JTAG requires desoldering eMMC and expert knowledge / datasheet for the flash chip pin out. i doubt this can be done in regular service center. such service usually is more expensive than (used/second hand) replacement device.
according to this aboot implements download mode, so flashing via Odin can't work. But PBL will fallback to EDL if SBL failed to initialize aboot
Thanks, I tried but when I flash this TWRP, I got stuck on splash screen.
It might be because I'm on gt510lte hardware.
When I edited the file on package for gt510lte, it worked !
Sadly no widevine on Lineageos so back to stock.
Thanks for your help and your kind work mate !