Default o3d network and iemi problem pls help

hi,
i have lgsu760 korean modle. i managed to flash ics but the network wasn't working so i flashed back the su760 rom.the phone didnt boot after flashing so i followed this http://forum.xda-developers.com/show....php?t=2246001 guide and stuck at flashing boot.bin. it is giving me error....failed remote partition does not exist.please help.(what is gb bootloaders btw)