have same problem, solved by flashing this radio UBML2 Radio.TAR - 12.00 MB
if get no network just go network options and search for network, my problem solved this way
this isn't flashing problem, this is a problem with efs . don't wost your time downloading and flashing version.
if this happend after unlocking with box try to restore the backup, then unlock phone via any server unlock request,
that worked for me, i used 32gb sandisk sdcard, and create the image on windows7 64bit using win32diskimager-v0.9-binary