Trouble unlocking BootLoader Sony Mobile Flasher

Hi, i have some trouble with my Xperia Mini Pro and SMF, i get this error message when i hit BLU and connect my Mini Pro:

Quote:

29/053/2016 12:53:01 - INFO - Flashtool Version 0.9.19.8 built on 24-09-2015 22:00:00 29/053/2016 12:53:01 - INFO - Executing search strategies to find proxy selector 29/053/2016 12:53:01 - INFO - No proxy found for IE. Trying next one 29/053/2016 12:53:01 - INFO - No proxy found for firefox. Trying next one 29/053/2016 12:53:01 - INFO - No proxy found for java. Trying next one 29/053/2016 12:53:04 - INFO - Please connect your device into flashmode. 29/053/2016 12:53:05 - INFO - Device disconnected 29/053/2016 12:53:18 - INFO - Device connected in flash mode 29/053/2016 12:53:19 - INFO - Opening device for R/W 29/053/2016 12:53:19 - INFO - Reading device information 29/053/2016 12:53:19 - INFO - Phone ready for flashmode operations. 29/053/2016 12:53:19 - INFO - Opening TA partition 2 29/053/2016 12:53:19 - INFO - Current device : SK17i - BX902T7GYC - 1250-0960_R24D - 1244-7088_4.0.2.A.0.62 - WORLD-i_4.0.2.A.0.62 29/053/2016 12:53:19 - INFO - Closing TA partition 29/053/2016 12:53:19 - ERROR - root : this bundle is not valid 29/053/2016 12:53:19 - INFO - Processing loader.sin 29/053/2016 12:53:19 - INFO - Checking header 29/053/2016 12:53:19 - ERROR - Processing of loader.sin finished with errors. 29/053/2016 12:53:19 - ERROR - Error in processHeader : 31 : Ein an das System angeschlossenes Gerät funktioniert nicht. 29/053/2016 12:53:19 - INFO - Your phone bootloader cannot be officially unlocked 29/053/2016 12:53:19 - INFO - You can now unplug and restart your phone 29/056/2016 12:56:08 - INFO - Flash canceled

Can anyone help? I checked "Is Bootloader unlockable?" and it said YES.
Don't know what the problem is, device is detected as SK17i, that's correct, but how can i proceed?

Thx...

from xda-developers http://ift.tt/297gdj4
via IFTTT