k800i urgent help

can sum1 plz show me how can i downgrade my k800i back to db2020, i had updated it with update service and i need that phone unlocked to use on 3 network thnks it is showing fone locked wen i put in orange or lyca sim

this is what i get wen i come to flash it
22:20:29| Baseband ID: 9900
22:20:29| Protocol Version: 3.1
22:20:30| Phone name detected!
22:20:30|
22:20:30| Profiling SEMC phone...
22:20:30| Platform: DB2020
22:20:30| OTP CID: 51
22:20:30| EROM CID: 53
22:20:30| EROM Color: Red
22:20:30| IMEI: 35908701xxxxxx
22:20:30| Phone ID: K800
22:20:30| Region: EUROPE_4
22:20:30| CDA: CDA102511/101 R2A
22:20:30| Firmware Version: R8BF003
22:20:30| EROM: R3A022
22:20:30| Ready for operation!
22:22:42| Sorry, your phone is NOT SUPPORTED
22:22:42| Error: Cannot send flash loader
22:22:42| Error: Flashing failed
22:22:44| Disconnected... Unplug the phone