W580i Firmware

What firmware and main file should I use if I want the phone to work on a UK network? I can't spend hours looking, I really just need the two links. I know how to flash the firmware.

I bought the phone unlocked, but branded to Orange UK. I flashed it tonight (hoping for it to work) and it now doesn't recognise my SIM card. Although I haven't tried an Orange SIM card yet as I don't have one.

Basically, I need to restore the phone to a factory state so o2 can use it and so there is no horrible branding on it. Here's the info I have on Software Info:

R8BE001
prgCXC1123362_GENERIC_LA R8BE001

EROM: R3A022
prg CXC1250616_EROM_DB2020_HB106GENERIC_FOTA_SIMLOCK_F LAFLA_SIBLEY_SEMCUSB

(Then skipping the LCD and camera version etc)

Customization
CDA102774/18 R11A
cxc1123364 R8BE001
ORANGE_GEN

I would be so thankful if you could help me. As I said. I just want it so there's no branding and so I can use it on o2. Please give me a guide on how to do this.

Thank you