Sorry Dude. You Can Only Flashed Your K800 To K810 Which Will Gain You With TrackID, Photofix And Newer Java Version. If You Flash It With A Walkman Firm, Some Of The Thing Like Camera, Bluetooth etc Might Not Work. If You Want A Walkman Player, You Can Use A Patch. For Walkman Patch, See Patches For All DB2020 CID52 Phones - Top Sony Forums