[Xperia Arc General] cool_recep:
I have tried to update my device to 4.1.A.0.562 but that brought SIM lock to my device!

I am trying to unlock it now. It only flashed simlock.ta.

For reference:

25/021/2012 01:21:18 - INFO - <- This level is successfully initialized
25/021/2012 01:21:18 - INFO - Flashtool Version 0.7.1.0 built on 2012-05-01 22:07:23
25/021/2012 01:21:18 - INFO - You can drag and drop ftf files here to start flashing them
25/021/2012 01:21:23 - INFO - Device disconnected
25/021/2012 01:21:31 - INFO - Device connected with USB debugging off
25/021/2012 01:21:31 - INFO - For 2011 devices line, be sure you are not in MTP mode
25/021/2012 01:21:32 - INFO - Device connected with USB debugging on
25/021/2012 01:21:33 - INFO - Connected device : LT18
25/021/2012 01:21:33 - INFO - Installed version of busybox : N/A
25/021/2012 01:21:33 - INFO - Android version : 4.0.3 / kernel version : 2.6.32.9-perf
25/021/2012 01:21:48 - INFO - Selected LT18_4.1.A.0.562_NCB.ftf
25/021/2012 01:21:48 - INFO - Preparing files for flashing
25/021/2012 01:21:48 - INFO - Please connect your device into flashmode.
25/021/2012 01:21:52 - INFO - Device disconnected
25/022/2012 01:22:24 - INFO - Device connected in flash mode
25/022/2012 01:22:24 - INFO - Opening device for R/W
25/022/2012 01:22:24 - INFO - Reading device information
25/022/2012 01:22:24 - INFO - Phone ready for flashmode operations.
25/022/2012 01:22:25 - INFO - Start Flashing
25/022/2012 01:22:25 - INFO - Flashing loader
25/022/2012 01:22:27 - INFO - Loader : S1_Loader_Root_773f - Version : R4A066 / Bootloader status : NOT_ROOTABLE / IMEI : 01268200539423
25/022/2012 01:22:27 - INFO - Flashing simlock.ta
25/022/2012 01:22:27 - INFO - Writing TA unit : [00, 00, 07, DA, 00, 00, 01, 3C, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 02, 00, 05, 0A, 02, 00, 00, 00, 0A, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 02, 00, 00, 00, 0A, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 48, 4F, 50, 5F, 49, 44, 3D, 22, 36, 39, 39, 22, 3B, 4F, 50, 5F, 4E, 41, 4D, 45, 3D, 22, 43, 75, 73, 74, 6F, 6D, 69, 7A, 65, 64, 22, 3B, 43, 44, 41, 5F, 4E, 52, 3D, 22, 31, 32, 35, 35, 2D, 31, 37, 35, 33, 22, 3B, 52, 4F, 4F, 54, 49, 4E, 47, 5F, 41, 4C, 4C, 4F, 57, 45, 44, 3D, 22, 31, 22, 3B, 00, 00, 00, 09, 00, 07, 30, 30, 31, 30, 31, 2D, 2A, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 02, 00, 00, 00, 0A, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 02, 00, 00, 00, 0A, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 02, 00, 00, 00, 0A, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 02, 00, 00, 00, 0A, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 14, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00]
25/022/2012 01:22:27 - INFO - Ending flash session
25/022/2012 01:22:27 - INFO - Flashing finished.
25/022/2012 01:22:27 - INFO - Please wait. Phone will reboot
25/022/2012 01:22:27 - INFO - For flashtool, Unknown Sources and Debugging must be checked in phone settings
25/022/2012 01:22:28 - INFO - Device connected in flash mode
25/022/2012 01:22:53 - INFO - Device disconnected

Had to buy Wotan to unlock the SIM. Damn!

Loading QC loader
Reconnecting phone
Initializing
(N/A)
IMEI: UNKNOWN
Loading S1 loader
IMEI: [Removed]
Writing new EROM
Checking your account...
Account OK, 1 credits remain
Calcing, please wait...
done.
Writing signatures
Repairing TA
Done! Disconnect phone and power it on.