[Q] Back to stock via flashtool

[Mr. Schnabel]

Hi fellas!

Have tested out LineageOS on my unlocked Z4 Tab wifi vers. SGP712 but now want to get back to stock.
Unfortiunatly i have no twrp backup so i am trying out the Flashtool by androxyde wich always worked w/o problems for upgrading stock.

But now since i am on LineageOS i am having a hard time to get it to work Here is the log:

07/014/2018 17:14:33 - INFO - <- This level is successfully initialized
07/014/2018 17:14:33 - INFO - Flashtool Version 0.9.24.4 built on 01-02-2018 22:15:00
07/014/2018 17:14:33 - INFO - Searching for a web proxy
07/014/2018 17:14:33 - INFO - No proxy found, using direct connection
07/014/2018 17:14:33 - INFO - Syncing devices from github
07/014/2018 17:14:33 - INFO - Opening devices repository.
07/014/2018 17:14:33 - INFO - Scanning devices folder for changes.
07/014/2018 17:14:40 - INFO - Pulling changes from github.
07/014/2018 17:14:40 - INFO - Devices sync finished.
07/014/2018 17:14:41 - INFO - Loading devices database
07/014/2018 17:14:41 - INFO - Loaded 100 devices
07/014/2018 17:14:41 - INFO - Starting phone detection
07/014/2018 17:14:44 - INFO - Device disconnected
07/014/2018 17:14:55 - INFO - Selected Bundle for Sony Xperia Z4 Tablet(SGP712). FW release : 32.4.A.1.54_R1E. Customization : Customized CE1
07/014/2018 17:14:55 - INFO - Preparing files for flashing
07/015/2018 17:15:16 - INFO - Please connect your device into flashmode.
07/015/2018 17:15:37 - INFO - Using Gordon gate drivers version 3.2.0.0
07/015/2018 17:15:37 - INFO - Opening device for R/W
07/015/2018 17:15:37 - INFO - Device ready for R/W.
07/015/2018 17:15:37 - INFO - Reading device information
07/015/2018 17:15:38 - INFO - Phone ready for flashmode operations.
07/015/2018 17:15:38 - INFO - Opening TA partition 2
07/015/2018 17:15:38 - INFO - Current device : Unknown: Jun 9 2017/20:03:06 - CB5A25P7KR - Unknown: Jun 9 2017/20:03:06 - Unknown: Jun 9 2017/20:03:06 - GENERIC_32.3.A.0.376
07/015/2018 17:15:38 - INFO - Closing TA partition
07/015/2018 17:15:38 - ERROR - The bundle does not match the connected device
07/015/2018 17:15:38 - INFO - Ending flash session
07/015/2018 17:15:39 - INFO - Device disconnected

Tried different USB Cables, different Flashtool versions, re-installed all drivers, tried different .ftf versions, etc. etc, etc.

Nothing works And with no flashable stock .zip i am out of options ...

So, any of you guys ever encountered such a problem? Or have any advice for me?

Many thx fellas

Cheers Schnabel