(Do It at Your Own Risk)
Download Flash tool from : http://androxyde.github.io/index.html?1366612053000
Download full package of applications required to root device from :
http://www.4shared.com/folder/H9DBqb9i/Root_Xperia_Arc_or_Arc_S.html
now settings required for phone :
(1) go to settings -> Display -> Sleep -> 10 mins.
(2) go to settings -> Developer Options -> Enable Usb Debugging
(3) go to settings -> Xperia -> Connectivity -> Usb Connection Mode -> Mass Storage Mode (MSC)
(4) go to settings -> Security -> Enable Unknows Sources
Start Rooting Your Phone :
(1) Install Flash tool
(2) Install Adb Drivers (its in C:\Flashtool\drivers\Flashtool-drivers.exe)
(3) go to C:\Flashtool\firmwares and delete all files
(4) Copy and Paste lt18i_LT18_4.1.A.0.562_kernel only.ftf to C:\Flashtool\firmwares
(5) Now Start Flash tool
(6) Click on Flash Icon
(7) Selcect Flash Mode and click OK
(8) After completing this disconnect you phone and exit from Flash tool.
(9) Restart Your Phone and reconnect it with PC
(10) Now unzip Xperia-ICS-ROOT-emu-busybox-su.zip go to extracted folder and right click on runme.bat, click on run as administrator
(11) as this process will complete it will automatically restart your phone
(12) Now go to C:\Flashtool\firmwares and delete all files
(13) Copy and Paste LT18i_4.1.B.0.587_Kernel.ftf
(14) Follow step 5,6 & 7
(15) Your Phone has been ROOTED completely
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