K850i Acting up

My friend has a K850i which is playing up the keypad lights come on and the blue LED near the camera lens but that is all that happens,Any soloutions? will just a reflash work ie: Main,Fs,Custpack?

If so which ones should i use as i am new to this,The phone Identity is as below i think it was on o2 network

ChipID:C802,EMP protocol:0401

PHONE STATE: "RETAIL"
FLASH CID: 0052
OTP LOCKED:1 CID:52 PAF:1 IMEI:3518290278XXXXCERT:RED
LDR:2009-04-21 18:09 CXC1250843_DB31XX_CS_LOADER_ACC_SDRAM_R2A081
LDR:2009-04-21 18:10 CXC1250780_DB31XX_CS_LOADER_APP_SDRAM_R2A081

Model:K850i
MAPP CXC article: R1FA035 prg12004400_GENERIC_SO
MAPP CXC version: R1FA035
Language Package:CENTRAL-EUROPE
CDA article: 1202-3377
CDA version: R11A
Default article: 1200-5441
Default version: R1FA035

Operator: 000-00

Thankyou

It's ok i have sorted it now,But there is one thing that didnt work.

I flashed the phone fine and used the vodafone cust pack because it was on voda before,then the person that owns it wants to change to 3 network, so i tried just flashing the 3 cust pack on its own without flashing the Main and FS again and it didn't work?

Do you have to flash all three again for it to work?

Just kept returning litle err messages when trying to ad the custom files at the end part of the cust flashing operation.

Thanks everyone for your help and patience.

changing firmware is not that easy, you need to flash '3' MAIN, FS and custpack

I sort of got round it,even though vodafone don't simlock there phones,i sim-unlocked it any way with aerix then flashed just the 3 cust pack, which changed all the correct settings for My3 and the web etc but left the voda startup splash and the vodalive gif image on the desktop left softkey, but that doesn't bother them so sorted it.

Once again i thank everyone for there help and this great site.

Djp76:a013