[Xperia Z1 Compact Q&A, Help & Troubleshooting] mboehm83:
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\1.20.2\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