Sony Xperia Tablet Z SGP321 hard-bricked - help needed

Dear XDA-developers!

I have a big problem with my SGP321.

What I did to get into it:
1. I had two SGP321 tablets (with different serial numbers, let's call them SN1 and SN2).
2. In TWRP I made backups from SN1 to ext-sdcard.
3. I installed TWRP to SN2, then renamed TWRP/SN1 folder on ext-sdcard to TWRP/SN2. (it was very wrong decision!!!! do not repeat my mistake!!!)
4. I restored TWRP/SN2 to SN2 with all default settings (so restored all SN1's partitions /boot, /ta, /system, /cache, /data to SN2 ). (it was very wrong decision!!!! do not repeat my mistake!!!)

For now I have only SN2 in hard-bricked state.
* It blinks red on charge but does not consume current.
* It connects to PC only in flashmode, so fastboot mode is not available.
* Windows 8.1 PC detects it as SOMC Flash Device (USB VID 0x0fce, USB PID 0xadde).
* FlashTool reports the following:

Code:

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04/004/2016 13:04:17 - INFO - Flashtool Version 0.9.18.6 built on 30-05-2015 22:30:00
04/004/2016 13:04:17 - INFO - Executing search strategies to find proxy selector
04/004/2016 13:04:18 - INFO - No proxy found for IE. Trying next one
04/004/2016 13:04:18 - INFO - No proxy found for firefox. Trying next one
04/004/2016 13:04:18 - INFO - No proxy found for java. Trying next one
04/004/2016 13:04:22 - INFO - Device disconnected
04/004/2016 13:04:36 - INFO - Selected Bundle for Sony Xperia Tablet Z (SGP321). FW release : 10.7.A.0.222. Customization : VMo RU/UA/KZ
04/004/2016 13:04:36 - INFO - Preparing files for flashing
04/005/2016 13:05:02 - INFO - Please connect your device into flashmode.
04/005/2016 13:05:17 - INFO - Device connected in flash mode
04/005/2016 13:05:18 - INFO - Opening device for R/W
04/005/2016 13:05:18 - INFO - Reading device information
04/006/2016 13:06:17 - INFO - Unable to read from phone after having opened it.
04/006/2016 13:06:17 - INFO - trying to continue anyway
04/006/2016 13:06:17 - INFO - Start Flashing
04/006/2016 13:06:17 - INFO - Processing loader.sin
04/006/2016 13:06:17 - INFO - Checking header
04/006/2016 13:06:17 - ERROR - Processing of loader.sin finished with errors.
04/006/2016 13:06:17 - INFO - Ending flash session
04/006/2016 13:06:17 - ERROR - Error in processHeader : 22 : Устройство не опознает команду.
04/006/2016 13:06:17 - ERROR - Error flashing. Aborted
04/006/2016 13:06:17 - INFO - Device disconnected
04/006/2016 13:06:21 - INFO - Device connected in flash mode

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* Sony Emma does not detect my tablet.
* Sony PC Companion 2.1 detects my tablet as "Sony / Sony Ericsson phone / tablet" and shows two applications for it - "Support Zone" and "Media Go".
* S1tool 30.05.2014 does not detect my tablet.

Sony service says that I need motherboard replacement (but it is out of stock).

Is it possible to repair my tablet at home? Does SGP321 have test-point for S1tool?
What do you recommend to unbrick my tablet?

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