Hello,
i have a K850i phone, i've tried to flash it but it's telling me "Configuration error. Please contact your network service or center service" on my phone.

Maybe i don't use the correct custom files coz it's a bit confusing.
Here's the files : K850_R1EA031_MAIN_GENERIC_SO_RED52.mbn
K850_R1EA031_FS_WESTERN-EUROPE_RED52.fbn
K850i_1201-0077_R11A_GENERIC_WESTERN-EUROPE.zip

And here's the identify log from A2 uploader :
PHONE STATE: "RETAIL"
FLASH CID: 0052
OTP LOCKED:1 CID:52 PAF:1 IMEI: CERT:RED

Model:K850i
MAPP CXC article: R1EA031 prg12004400_GENERIC_SO
MAPP CXC version: R1EA031
Language Package:ADRIATIC
CDA article: 1202-0000
CDA version: segsm
Default article: 1200-5441
Default version: R1EA031