you need these files from the topsony download
K800_R8BF003_MAIN_GENERIC_WI_RED53
K800_R8BF003_FS_EUROPE_3_RED53
HB1-06_Gen_CDA102568_12_R8A_GENERIC_EUROPE_3
and about changing the cam driver, i think you are not following the complete procedure. if you want to unlock, read here too :
Patching CID53 (DB2020)DB2010,2012 - Top Sony Forums
and Remove SIM-lock patch generator - Top Sony Forums