Boot Loop and does not enter recovery screen

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Hi folks,

my trusty S3 (SM-T825) got broke unexpectedly. It showed "100% battery" in the morning but was unresponsive. A forced shutdown did reboot the device up to the logo-screen - from where it rebooted again. So obviously it's stuck in a boot loop.

Unfortunately, it does not enter "recovery" either (home) (up) (power). However, it DOES enter "ODIN mode" (home) (down) (power). There it shows me that FRP Lock and OEM lock both are still active. This is no wonder as it caught me unprepared. FRP lock wouldn't be a problem, as I'm the owner of the account and can supply credentials once it boots up again.

Everywhere it is STRONGLY advised to turn off OEM lock before flashing anything to not make it even worse. This renders the device essentially dead, right?

The device is still as original as it can be.

Any chance I can revive it or does that more look like a mainboard problem?

I already have ODIN and I even have an actual 4-part "Original ROM" for my region (Samfw.com_SM-T825_ATO_T825XXU3CTD1_fac.zip), but maybe TWRP and Lineage would be the better options.

Before I just go and make things worse, I'd like to ask for a qualified advice ;-)
 

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...... There it shows me that FRP Lock and OEM lock both are still active. This is no wonder as it caught me unprepared. FRP lock wouldn't be a problem, as I'm the owner of the account and can supply credentials once it boots up again.

Everywhere it is STRONGLY advised to turn off OEM lock before flashing anything to not make it even worse. This renders the device essentially dead, right?
Afaik you should be able to flash stock with OEM lock active BUT idk if FRP will block flashing process.
If that happens it's imo afterwards in the same state as before so at least it won't worsen it.
Gonna loose all your data anyhow.
Got Smartswitch? This might help as well.
....... I already have ODIN and I even have an actual 4-part "Original ROM" for my region (Samfw.com_SM-T825_ATO_T825XXU3CTD1_fac.zip), but maybe TWRP and Lineage would be the better options.
You can't replace recovery without OEM unlock.
Before I just go and make things worse, I'd like to ask for a qualified advice ;-)
Dunno if I'm qualified enough ;)
 
Last edited:
Next turn ...

I tried flashing TWRP into the AP slot with SamFW FRP-Tool (ODIN). This worked so far but got me a note on the tablet "custom recovery blocked due to FRP lock".

Checking boot on the tablet - as before. Boot loop.

Next turn ...

Code:
Select file AP_T825XXU3CTD1_CL17011592_QB30231355_REV00_user_low_ship_MULTI_CERT_meta_OS9.tar.md5

Select file CP_T825XXU3CTA1_CP14962504_CL17011592_QB28791445_REV00_user_low_ship_MULTI_CERT.tar.md5

Select file CSC_ATO_T825ATO3CTD1_CL18361310_QB30233690_REV00_user_low_ship_MULTI_CERT.tar.md5
Reading... OK
Detect mode: Download mode

Model        : SM-T825
Bit        : 4
Unique number    : CBJ100915EAF124
Storage        : 32
Vendor        : SAMSUNG
Disk        : BJNB4R
Firmware    : https://samfw.com/firmware/SM-T825/

Analyze files...
Flashing with SAMSUNG Mobile USB Modem (COM5)
Flash failed
Flash time: 00:47
Reading... FAIL

unchecking CP and CSC, leaving only AP.

Code:
Analyze files...
Flashing with SAMSUNG Mobile USB Modem (COM5)
Flash failed
Flash time: 10:00

Reading... FAIL

Reboot tablet in download-mode, next turn: Try BL + AP:

Code:
Select file BL_T825XXU3CTD1_CL17011592_QB30231355_REV00_user_low_ship_MULTI_CERT.tar.md5
Reading... OK
Detect mode: Download mode

Model        : SM-T825
Bit        : 4
Unique number    : CBJ100915EAF124
Storage        : 32
Vendor        : SAMSUNG
Disk        : BJNB4R
Firmware    : https://samfw.com/firmware/SM-T825/

Analyze files...
Flashing with SAMSUNG Mobile USB Modem (COM5)
Checking file BL_T825XXU3CTD1_CL17011592_QB30231355_REV00_user_low_ship_MULTI_CERT.tar.md5
Checking file AP_T825XXU3CTD1_CL17011592_QB30231355_REV00_user_low_ship_MULTI_CERT_meta_OS9.tar.md5
Flashing (1/20) emmc_appsboot.mbn.lz4    OK
Flashing (2/20) lksecapp.mbn.lz4    OK
Flashing (3/20) xbl.elf.lz4Flash failed
Flash time: 01:26

Tablet moans about
SW REV CHECK FAIL : [lksecapp] Fused -1 > Binary 0
So maybe the firmware revision is different to the currently installed one? The latest file is from 2020 and since I did the usual OTA updates, this should be the version installed. But even if not, it sould not matter to upload a newer one, right?

Anything I can check?