go here :
http://forum.ppcgeeks.com/showthread.php?t=20370
Then flash the orginal 0.40 version for its relocking abilities as said here :Original 0.40 Version (mosty outdated except for "relocking" ability, also more dangerous than 0.41 and 2.31)
VERY IMPORTANT / Warning: If your carrier did not release a rom and you flash an exe of another carrier with the 0.40 unlocker you won't be able to flash ANY rom until unlocking again (this requires
booting into WM) POSTED IN THREAD OF LINK GIVEN
ALL THANKS GOES TO ImCoKeMaN