i was tryin to upgrade my firmware of the phone

and after i finished usin the phonexs++ v1.6.8 beta
and it said that the operation done successfully

but when i turn my phone on and after i started the phone mode

it cames up 2 me with this message:

Configuration error>
Please contact your network operator or service center.

and i cant use anything of my phone except the walkman player

i have flash it with these 2 files:

W900_R5BC004_MAIN_GENERIC_SA_EU_EMEA.mbn
W900_R5BC004_FS_EMEA_6.DVT

and i have try onther versions of FS files like these too:
W900_R5BB001_FS_EMEA6.DVT
W900_R5AF001_FS_EMEA6.DVT

and nothin happne still get that damn error msg

so anyone know anuthin about this plzz help me and thanx on advance guyz