Unlocking Bootloader again don't work topic

Greetings,

I have a big problem with my Z1 Compact.

When I started flashing the phone is was a noob and did not make a backup of my TA Keys and my firmware.

I have unlocked the bootloader and was able to install Cyanogenmod, SlimRom ....

Then I went back to a stock rom (I think it was a Russian ROM) and I was not able to receive System Updates from Sony.

After that i re-locked my bootlader and I was able to receive updates.

So I want to get back to Custom Rom and I am not able to re-unlock my bootloader with flashtool oder adb.

Anytime when i try to unlock bootloader I get the following message:

FAILED (remote: Command did not succeed)

When I try again I get the following message:

FAILED (remote: Device is already rooted)


I have searched many threads and I did not find a good answer. So i contacted Sony Developer directly and the advised me to post this here ;)

My phone is unlocked und unbranded.

Here is the log from Flashtool:

19/042/2015 08:42:45 - INFO - Connected device : Sony Xperia Z1 Compact
19/042/2015 08:42:45 - INFO - Installed version of busybox : N/A
19/042/2015 08:42:45 - INFO - Android version : 4.4.4 / kernel version : 3.4.0-perf-g0109737 / Build number : 14.4.A.0.108
19/042/2015 08:42:45 - INFO - Checking root access
19/042/2015 08:42:45 - INFO - Root Access Allowed
19/042/2015 08:42:46 - INFO - Pushing E:\Flashtool\devices\busybox.20.2\busybox to /data/local/tmp/busybox
19/042/2015 08:42:46 - INFO - Installing toolbox to device...
19/042/2015 08:42:46 - INFO - Pushing E:\Flashtool\custom\root\ftkit.tar to /data/local/tmp
19/042/2015 08:42:46 - INFO - Running installftkit as root thru sysrun
19/043/2015 08:43:32 - INFO - Please connect your device into flashmode.
19/043/2015 08:43:35 - INFO - Device disconnected
19/043/2015 08:43:49 - INFO - Device connected in flash mode
19/043/2015 08:43:49 - INFO - Opening device for R/W
19/043/2015 08:43:49 - INFO - Reading device information
19/043/2015 08:43:49 - INFO - Phone ready for flashmode operations.
19/043/2015 08:43:49 - INFO - Current device : D5503 - CBxxxxxxxxxx- 1280-7864_R2C - 1279-1792_14.4.A.0.108 - EURO-LTE_14.4.A.0.108
19/043/2015 08:43:50 - INFO - Processing loader.sin
19/043/2015 08:43:50 - INFO - Checking header
19/043/2015 08:43:50 - INFO - Flashing data
19/043/2015 08:43:50 - INFO - Processing of loader.sin finished.
19/043/2015 08:43:50 - INFO - Loader : S1_Root_6732 - Version : MSM8974_23 / Boot version : S1_Boot_MSM8974_Rhine1.2_LA1.04_19 / Bootloader status : ROOTABLE
19/043/2015 08:43:50 - INFO - Start Reading unit 000008B2
19/043/2015 08:43:50 - INFO - Reading TA finished.
19/043/2015 08:43:50 - INFO - Ending flash session
19/043/2015 08:43:50 - INFO - Now unplug your device and restart it into fastbootmode
19/043/2015 08:43:50 - INFO - Device connected in flash mode
19/043/2015 08:43:51 - INFO - Device disconnected
19/044/2015 08:44:13 - INFO - Device connected in fastboot mode
19/044/2015 08:44:19 - INFO - Unlocking phone using key xxxxxxxxxxxxxxxx
19/044/2015 08:44:19 - INFO - ...
19/044/2015 08:44:19 - INFO - FAILED (remote: Command did not succeed)
19/044/2015 08:44:19 - INFO - finished. total time: 0.019s
19/044/2015 08:44:23 - INFO - Unlocking phone using key xxxxxxxxxxxxxxxx
19/044/2015 08:44:23 - INFO - ...
19/044/2015 08:44:23 - INFO - FAILED (remote: Device is already rooted)
19/044/2015 08:44:23 - INFO - finished. total time: 0.004s

I hope anybody can help me!

Thanks in advance

xda-developers