I had the same problem but with me it was the walkman,applications and games that stoped wotking, it not the Firmware it a problem with the file system, i updated mine using Davinciteam fixed the problem updated from R1CA029_RED52 to R1CA037_RED52 it cost 10EUR, there is now a update out on Sony Ericsson Update Service, but i think it only updates the firmware, when davinciteam software wipes the phone clean and installs all the new software like firmware and File systems, there is a Tutorials there under Flash A2 / DB3150 Phones that will help