Can't relock Bottloader & install Stock

Hello

i am using the Flashtool V 0.9.19.0 by androxyde.
At the moment it runs with cm12.1 (Android 5.1.1 Custom Rom)
when i want to relock my phone and flash a stock, it says that all things are done (without errors)
i tried different methods

First Try:
Start Flashtool:
BLU -> Plug the Phone -> Choose the Phone (C6603) -> it shows me my IMEI & unlock Code -> Press Relock
after that
Thunder -> Flashmode -> C6603_10.6.A.0.454_Customized_DE.ftf

Second Try:
Open Flashtool:
Thunder -> Flashmode -> C6603_10.6.A.0.454_Customized_DE.ftf
after that
Flashtool -> BLU -> Relock
Here i'll get an error (i didn't start a new instance of flashtool):

Quote:

28/026/2015 23:26:41 - ERROR - Processing of loader.sin finished with errors. 28/026/2015 23:26:41 - ERROR - Error in processHeader : 6 : Das Handle ist ungültig.

For the full log scroll down

i have still the CM12.1
i can't flash a stock rom and can't relock BL.
But i have my IMEI/DRM-Keys/etc.

could you help?

Here are the logs of flashtool
First Try:

Quote:

28/019/2015 23:19:57 - INFO - Flashtool Version 0.9.19.0 built on 29-07-2015 12:00:00 28/019/2015 23:19:57 - INFO - Executing search strategies to find proxy selector 28/019/2015 23:19:57 - INFO - No proxy found for IE. Trying next one 28/019/2015 23:19:57 - INFO - No proxy found for firefox. Trying next one 28/019/2015 23:19:57 - INFO - No proxy found for java. Trying next one 28/019/2015 23:19:57 - INFO - Syncing devices from github 28/019/2015 23:19:57 - INFO - Scanning devices folder for changes. 28/020/2015 23:20:01 - INFO - Pulling changes from github. 28/020/2015 23:20:02 - INFO - Devices sync finished. 28/020/2015 23:20:06 - INFO - Device disconnected 28/020/2015 23:20:33 - INFO - Please connect your device into flashmode. 28/022/2015 23:22:48 - INFO - Device connected in flash mode 28/022/2015 23:22:49 - INFO - Opening device for R/W 28/022/2015 23:22:49 - INFO - Reading device information 28/022/2015 23:22:49 - INFO - Phone ready for flashmode operations. 28/022/2015 23:22:49 - INFO - Opening TA partition 2 28/022/2015 23:22:49 - INFO - Current device : Unknown: Apr 27 2015/08:44:40 - CB5A1P9B9K - Unknown: Apr 27 2015/08:44:40 - Unknown: Apr 27 2015/08:44:40 - Unknown: Apr 27 2015/08:44:40 28/022/2015 23:22:49 - INFO - Closing TA partition 28/023/2015 23:23:19 - INFO - Processing loader.sin 28/023/2015 23:23:19 - INFO - Checking header 28/023/2015 23:23:20 - INFO - Flashing data 28/023/2015 23:23:20 - INFO - Loader : S1_Root_5ca3 - Version : APQ8064_30 / Boot version : S1_Boot_Lagan_1.1.1_1 / Bootloader status : ROOTED 28/023/2015 23:23:20 - INFO - Opening TA partition 2 28/023/2015 23:23:20 - INFO - Start Reading unit 000008B2 28/023/2015 23:23:20 - INFO - Reading TA finished. 28/023/2015 23:23:20 - INFO - Closing TA partition 28/023/2015 23:23:20 - INFO - Unlock code saved to C:\Users\uniQue\.flashTool\registeredDevices\CB5A1 P9B9K\ulcode.txt 28/023/2015 23:23:56 - INFO - Relocking device 28/023/2015 23:23:56 - INFO - Opening TA partition 2 28/023/2015 23:23:56 - INFO - Relock finished 28/024/2015 23:24:00 - INFO - Ending flash session 28/024/2015 23:24:00 - INFO - You can now unplug and restart your device 28/024/2015 23:24:01 - INFO - Device connected in flash mode 28/024/2015 23:24:06 - INFO - Device disconnected 28/024/2015 23:24:07 - INFO - Device connected in flash mode 28/024/2015 23:24:09 - INFO - Selected Bundle for Sony Xperia Z (C6603). FW release : 10.6.A.0.454. Customization : Customized_DE 28/024/2015 23:24:09 - INFO - Preparing files for flashing 28/024/2015 23:24:22 - INFO - Please connect your device into flashmode. 28/024/2015 23:24:23 - INFO - Opening device for R/W 28/024/2015 23:24:23 - INFO - Reading device information 28/024/2015 23:24:23 - INFO - Phone ready for flashmode operations. 28/024/2015 23:24:23 - INFO - Opening TA partition 2 28/024/2015 23:24:23 - INFO - Current device : Unknown: Apr 27 2015/08:44:40 - CB5A1P9B9K - Unknown: Apr 27 2015/08:44:40 - Unknown: Apr 27 2015/08:44:40 - Unknown: Apr 27 2015/08:44:40 28/024/2015 23:24:23 - INFO - Closing TA partition 28/024/2015 23:24:23 - INFO - Start Flashing 28/024/2015 23:24:23 - INFO - Processing loader.sin 28/024/2015 23:24:23 - INFO - Checking header 28/024/2015 23:24:23 - INFO - Flashing data 28/024/2015 23:24:24 - INFO - Loader : S1_Root_5ca3 - Version : APQ8064_39 / Boot version : S1_Boot_Lagan_1.1.1_1 / Bootloader status : ROOTED 28/024/2015 23:24:24 - INFO - Transfer buffer size : 262144 28/024/2015 23:24:24 - INFO - Parsing boot delivery 28/024/2015 23:24:24 - INFO - You must have the according fsc script to flash this device. 28/024/2015 23:24:24 - INFO - Flashing finished. 28/024/2015 23:24:24 - INFO - Please unplug and start your phone 28/024/2015 23:24:24 - INFO - For flashtool, Unknown Sources and Debugging must be checked in phone settings

Second Try:

Quote:

28/025/2015 23:25:47 - INFO - Flashtool Version 0.9.19.0 built on 29-07-2015 12:00:00 28/025/2015 23:25:47 - INFO - Executing search strategies to find proxy selector 28/025/2015 23:25:47 - INFO - No proxy found for IE. Trying next one 28/025/2015 23:25:47 - INFO - No proxy found for firefox. Trying next one 28/025/2015 23:25:47 - INFO - No proxy found for java. Trying next one 28/025/2015 23:25:47 - INFO - Syncing devices from github 28/025/2015 23:25:47 - INFO - Scanning devices folder for changes. 28/025/2015 23:25:51 - INFO - Pulling changes from github. 28/025/2015 23:25:52 - INFO - Devices sync finished. 28/025/2015 23:25:56 - INFO - Device disconnected 28/026/2015 23:26:10 - INFO - Selected Bundle for Sony Xperia Z (C6603). FW release : 10.6.A.0.454. Customization : Customized_DE 28/026/2015 23:26:10 - INFO - Preparing files for flashing 28/026/2015 23:26:23 - INFO - Please connect your device into flashmode. 28/026/2015 23:26:30 - INFO - Device connected in flash mode 28/026/2015 23:26:31 - INFO - Opening device for R/W 28/026/2015 23:26:31 - INFO - Device connected in flash mode 28/026/2015 23:26:31 - INFO - Reading device information 28/026/2015 23:26:31 - INFO - Phone ready for flashmode operations. 28/026/2015 23:26:31 - INFO - Opening TA partition 2 28/026/2015 23:26:31 - INFO - Current device : Unknown: Apr 27 2015/08:44:40 - CB5A1P9B9K - Unknown: Apr 27 2015/08:44:40 - Unknown: Apr 27 2015/08:44:40 - Unknown: Apr 27 2015/08:44:40 28/026/2015 23:26:31 - INFO - Closing TA partition 28/026/2015 23:26:31 - INFO - Start Flashing 28/026/2015 23:26:31 - INFO - Processing loader.sin 28/026/2015 23:26:31 - INFO - Checking header 28/026/2015 23:26:31 - INFO - Flashing data 28/026/2015 23:26:31 - INFO - Loader : S1_Root_5ca3 - Version : APQ8064_39 / Boot version : S1_Boot_Lagan_1.1.1_1 / Bootloader status : ROOTED 28/026/2015 23:26:32 - INFO - Transfer buffer size : 262144 28/026/2015 23:26:32 - INFO - Parsing boot delivery 28/026/2015 23:26:32 - INFO - You must have the according fsc script to flash this device. 28/026/2015 23:26:32 - INFO - Flashing finished. 28/026/2015 23:26:32 - INFO - Please unplug and start your phone 28/026/2015 23:26:32 - INFO - For flashtool, Unknown Sources and Debugging must be checked in phone settings 28/026/2015 23:26:38 - INFO - Please connect your device into flashmode. 28/026/2015 23:26:38 - INFO - Opening device for R/W 28/026/2015 23:26:38 - INFO - Reading device information 28/026/2015 23:26:38 - INFO - Unable to read from phone after having opened it. 28/026/2015 23:26:38 - INFO - trying to continue anyway 28/026/2015 23:26:41 - INFO - Processing loader.sin 28/026/2015 23:26:41 - INFO - Checking header 28/026/2015 23:26:41 - ERROR - Processing of loader.sin finished with errors. 28/026/2015 23:26:41 - ERROR - Error in processHeader : 6 : Das Handle ist ungültig. 28/026/2015 23:26:41 - INFO - Your phone bootloader cannot be officially unlocked 28/026/2015 23:26:41 - INFO - You can now unplug and restart your phone