w850i Flash HELP!!

hi
i have a w850i and i want to flash to a better firmware, but i don't know what's the best firmware for my w850i and can you give me please a tutorial ?
here are the settings:

21:03:27| Profiling SEMC phone...
21:03:27| Platform: DB2020
21:03:27| OTP CID: 49
21:03:27| EROM CID: 52
21:03:27| EROM Color: Red
21:03:27| IMEI:
21:03:27| Phone ID: W850
21:03:27| Region: EUROPE_2
21:03:27| CDA: CDA12345678/123 R2A
21:03:27| Firmware Version: R1JG001
21:03:27| EROM: R3A016
21:03:28| Ready for operation!

THX:D

Use this tutorial XS++ 3.1 Guide-Flashing, Customizing, Recovering - Top Sony Forums and this firmware files:
MAIN- W850_R1KG001_MAIN_GENERIC_CY_RED52
FS- W850_R1KG001_FS_EUROPE_2_RED52 and this
CUSTPACK- HB1-06_Gen_CDA102568_11_R5A_GENERIC_EUROPE_2 if your phone isn't branded (this is the newest firmware )