I have rooted my mobile few days back,i have sucessfully installed custom ROM(brains ROM) i tried to reinstall with the latest version while flshing in fastboot mode i have flashed with the "boot.img " file which i have downloaded from the internet. After doing flash my mobile is not booting any one can help on this please..now my phone is dead any one can give the breath to it please 
Was that boot.img for ST25i or 25a 
Form time to time there is problem with bootlooping after flashing, but especially with using fastboot, CWM... And also custom ROMs where is nt guarranted that everything will be fine. OK, end of theory.
You have to use SUS and install clean official ICS there, or use Flashtool, download particular .tft and flash.
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