Perhaps now you have a semi-operational device you can try performing a manual firmware update?
If you do grab a backup image of the microsd card as it is now beforehand.
Code:
Manual Update
1. Open site www.pocketbook-int.com. Select your
country.
2. Click the Support button on top menu. Select hardware model of your Device.
3. Download the Firmware to your PC.
4. Unpack the content of the archive, file SWUPDATE.BIN
and copy it to the root folder of internal Device storage.
5. Switch off the Device by pressing button On/Off.
6. Press and hold both Backward and Forward buttons.
7. Switch on the Device by pressing On/Off. Hold
both Backward and Forward buttons until the message
Firmware update… is displayed on the screen.
8. Follow the on-screen instructions with pictures:
connect USB cable to the Device and Press Menu Key
Latest firmware for the
T2 626
Latest firmware for the
T3 626