If we return to the locked bootloader on your terminal by "X" reasons the tutorial here.
NOTE: If using Pc Campanion the option "Repair" or by usingFlashtool. If you re-lock the boot loader (bootloader) for the use of a custom kernel your phone is dead.
1 - Download and extract S1tool an appropriate place in your PC(not necessary if you already have s1tool tutorial on how tounlock). (Credits to the_laser by this tool). This file is attached to the end of the tutorial.
2 - Then download and install Flashtool v0.2.9.1 beta (do not use0.3.0.0)
FlashTool_0.2.9.1 _Beta
After installation,open the folderflashtool.Double-click the fileand installggsetup-2.2.0.10.exe.(Requiredto work inFlashtool).Said. "Exe"works forX8, X10and X10minipro.Notsurethat works100%W8.
Note: This installation(Flashtooland Gordon) is not necessaryif you alreadyhave.
3 -Turn offyour phone.
4 -Runs1tool.exeon your PC.Thenclickthe Restore buttonand then connect thephone to thePCflashmode(pressand hold the"Back" button(thearrow)toconnect thephone to thePC).
5 -Wait until theprocess iscomplete.Congratulations!Ahwasblockedagain for yourbootloader.
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To check, opens1tool.exe, clickthe Identify button, turn offthe phone,plug intothePCflash mode(pressand hold thebackbuttontoconnect thephone to thePC).Thephone'sLEDshould flash greenand wait forthe softwarealong someoutput like this:
If the line from S1_EROM version "# $ 8A02" is a lowercase "r" proxy of "#" (UP TO SEE S1_EROM "r8A02 $"), the bootloader is not successfully closed again . If you have a capital "R" replacingthe "#" (UP TO SEE S1_EROM "$ R8A02"), the bootloader has been successfully blocked again.Code:9/9/2011 21:41:44 Welcome to S1 identify tool 9/9/2011 21:45:13 9/9/2011 21:45:13 TO CONNECT NEXT PHONES 9/9/2011 21:45:13 X10 Xperia,E10 Xperia Mini,E15 Xperia X8,U20 Xperia Mini Pro 9/9/2011 21:45:13 LT15 Xperia ARC,MT15 Xperia NEO,R800 Xperia PLAY 9/9/2011 21:45:13 PRESS AND HOLD "BACK" BUTTON... 9/9/2011 21:45:13 9/9/2011 21:45:13 PLEASE ATTACH TURNED OFF PHONE NOW 9/9/2011 21:45:13 9/9/2011 21:45:46 9/9/2011 21:45:46 RUNNING S1_EROM VER "r8A029" 9/9/2011 21:45:46 SOFTWARE AID: 0001 9/9/2011 21:45:46 LOADER AID: 0001 9/9/2011 21:45:49 FLASH ID: "002C/00BC" 9/9/2011 21:45:49 LOADER VERSION: "R4A045" 9/9/2011 21:45:49 9/9/2011 21:45:49 MODEL (from GDFS): X8 9/9/2011 21:45:49 SOFTWARE VERSION: 1236-9291_2.1.1.A.0.6 9/9/2011 21:45:49 CUSTOM VERSION: 1241-3178_R1B 9/9/2011 21:45:49 FILESYSTEM VERSION: WORLD-1-8_2.1.1.A.0.6 9/9/2011 21:45:49 SERIAL NO: CB511SPH7Q 9/9/2011 21:45:49 9/9/2011 21:45:49 SEMC SIMLOCK CERTIFICATE 9/9/2011 21:45:49 Elapsed:36 secs.