hey i dint give it to sony ericsson service center but gave it to a local guy
coz my warranty period was over

and abt firmware i have R4CA004, this is the software for w550

now i have R4CB020 downloaded from topsony with phonexc v6, phone xs , xs++, which software shud i use to flash the phone to latest firmware

and my phone is cid49 brown one

plz help detailed instructions