Sony Xperia S - Bootloader lässt sich nicht mehr sperren

Ich habe versucht den Bootloader wieder zu sperren (handy-faq.de/forum/sony_ericsson_xperia_arc_forum/236218-bootloader_sperren.html) und Flashtool gibt mir immer das im Log:

31/005/2013 17:05:56 - INFO - Selected Xperia_Relock_bootloader.ftf
31/005/2013 17:05:56 - INFO - Preparing files for flashing
31/005/2013 17:05:56 - INFO - Please connect your device into flashmode.
31/006/2013 17:06:01 - INFO - Device connected in flash mode
31/006/2013 17:06:02 - INFO - Opening device for R/W
31/006/2013 17:06:02 - INFO - Reading device information
31/006/2013 17:06:02 - INFO - Phone ready for flashmode operations.
31/006/2013 17:06:02 - INFO - Current device : LT26i - BX9039DA3F - 1257-6750_R3G - 1252-0023_6.1.A.2.45 - WORLD_6.1.A.2.55
31/006/2013 17:06:02 - INFO - Start Flashing
31/006/2013 17:06:02 - INFO - Processing loader
31/006/2013 17:06:02 - INFO - Checking header
31/006/2013 17:06:02 - INFO - Ending flash session
31/006/2013 17:06:02 - ERROR - ERR_SEVERITY="MAJOR";ERR_CODE="0019";ERR_DYNAMIC="SIN header verification failed";

— geändert am 04.04.2019, 23:11:21 durch Moderator