Bricked tablet? Everything ok, but fastboot.

[farfetch]

Hey guys.
I'll try to be most synthetic I can.
3 Days ago:
- bought tablet SGP712 WiFi (Italy) - unknown version of Lollipop.
- 1st try to unlock BL (fastboot, remote command not allowed) , disabled MyXperia, unlock ok
- flashed AndroPlusKernel V2, WiFi KO.
- flashed system update with companion app, everything ok
Yesterday:
- tried AndroPlus V3, remote command not allowed; tried to unlock BL, same; tried to disable MyXperia, settings corrupted: "MyXperia screen" is black
Today:
- Restored with Companion; Kernel and BL unlock, remote command not allowed
- Activate MyXperia (wondering to enable and then disable it), then same black screen.
- download last FW with XperiFirm, tried to decrypt with FlashTool: FlashTool crashes, but left me a 2GB .tft file and another .tft file
- tried to TFT flash, stuck at start (more than 20mins waiting) of writing data, tried to start up after disconnecting from PC: "update failed blablabla"
- restored with Companion, everything ok, but fastboot again :/

EDIT: With new FlashTool version, I am finally able to make a tft file, but look at the attachment

Please, help

P.S.: I learned my IDID code...just sayin'

 

[Boal]

Had the same problem, I think. Despite having unlocked the BL, I could not use fastboot any more. Everything failed. I ended up returning the device.

 

[Charsher47]

I would suggest getting FlashTool working and wipe everything, best to start from scratch. Have you tried another pc? Afterwards, I would say don't even open the MyXperia app.

 

[farfetch]

I haven't another PC...May could I get the .tft file somewhere from the web?

 

[farfetch]

up

 

[farfetch]

up

 

[farfetch]

up

 

[farfetch]

See attachments

 

[farfetch]

1st post updated.
@Charsher47

 

[farfetch]

I just noticed, everything I reboot 'Protection by my Xperia' under Settings => Security => Device administrators, automatically turns on, but under Settings => Security => my xperia, it still be off
:/