[XPERIA X8 Q&A, Help & Troubleshooting] gferen:
i succesfuly unlocked bootloader too.

confirmed again

installed stock 2.1 version of software (with SEUS)

update flashtool to 0.5.3. ...

root

unlock bootloader

:)

25/031/2011 10:31:24 - INFO - <- This level is successfully initialized
25/031/2011 10:31:26 - INFO - Device connected with USB debugging on
25/031/2011 10:31:27 - INFO - Connected device : E15
25/031/2011 10:31:27 - INFO - Installed version of busybox : BusyBox v1.19.0 (2011-08-14 23:46:58 CDT) multi-call binary.
25/031/2011 10:31:27 - INFO - Android version : 2.1-update1 / kernel version : 2.6.29
25/031/2011 10:31:27 - INFO - Root Access Allowed
25/031/2011 10:31:41 - INFO - Searching Xperia....
25/031/2011 10:31:41 - ERROR - Please plug you device in flash mode
25/031/2011 10:31:42 - INFO - Searching Xperia....
25/032/2011 10:32:06 - INFO - Found at USB\VID_0FCE&PID_ADDE\6&DF2EE03&0&7
25/032/2011 10:32:06 - INFO - VER="R8A029";DATE="20100601";TIME="12:17:00";
25/032/2011 10:32:06 - INFO - Start Reading property
25/032/2011 10:32:06 - INFO - Reading property finished.
25/032/2011 10:32:06 - INFO - Found semcSL
25/032/2011 10:32:06 - INFO - You can now unplug and turn on device, then plug it again
25/032/2011 10:32:06 - INFO - Waiting for device
25/032/2011 10:32:06 - INFO - Device connected in flash mode
25/032/2011 10:32:34 - INFO - Device disconnected
25/033/2011 10:33:31 - INFO - Device connected with USB debugging on
25/033/2011 10:33:33 - INFO - Pushing C:\Flashtool\custom\features\UnlockBL\files\my7227\my7227bootwrite_semcSL to /data/local/tmp
25/033/2011 10:33:33 - INFO - Pushing C:\Flashtool\custom\features\UnlockBL\files\my7227\mapper_2.6.29.ko to /data/local/tmp
25/033/2011 10:33:33 - INFO - Pushing C:\Flashtool\custom\features\UnlockBL\files\my7227\fixPart to /data/local/tmp
25/033/2011 10:33:34 - INFO - Running runfixPart as root thru sysrun
25/033/2011 10:33:34 - INFO - Successfully applied fixPart. Rebooting
25/033/2011 10:33:35 - INFO - Waiting for device
25/033/2011 10:33:37 - INFO - Device disconnected
25/033/2011 10:33:47 - INFO - Device connected with USB debugging off
25/033/2011 10:33:57 - INFO - Device connected with USB debugging on
25/034/2011 10:34:20 - INFO - Running runbootwrite as root thru sysrun
25/034/2011 10:34:22 - INFO - Successfully applied unlock. Rebooting
25/034/2011 10:34:22 - INFO - Running runClean as root thru sysrun
25/034/2011 10:34:24 - INFO - Device disconnected
25/034/2011 10:34:34 - INFO - Device connected with USB debugging off
25/035/2011 10:35:37 - INFO - Device disconnected
25/035/2011 10:35:41 - INFO - Device connected with USB debugging off

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s1tool log
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Welcome to S1 identify tool

TO CONNECT NEXT PHONES
X10 Xperia,E10 Xperia Mini,E15 Xperia X8,U20 Xperia Mini Pro
LT15 Xperia ARC,MT15 Xperia NEO,R800 Xperia PLAY
PRESS AND HOLD "BACK" BUTTON...

PLEASE ATTACH TURNED OFF PHONE NOW

RUNNING S1_EROM VER "r8A029"
SOFTWARE AID: 0001
LOADER AID: 0001
FLASH ID: "0020/00BC"
LOADER VERSION: "R4A045"

MODEL (from GDFS): E15i
SOFTWARE VERSION: 1236-9291_2.1.1.A.0.6
CUSTOM VERSION: 1241-4047_R2B
FILESYSTEM VERSION: WORLD-1-8_2.1.1.A.0.6
SERIAL NO: BX902D6JL1

SEMC SIMLOCK CERTIFICATE
Elapsed:29 secs.

thaks developers :D