You need these 3 files:
Downloads - R8BC004_RED52 - K770_R8BC004_FS_EUROPE_2_RED52 - Top Sony Forums
Downloads - R8BC004_RED52 - K770_R8BC004_MAIN_GENERIC_VI_RED52 - Top Sony Forums
HB1-06_Gen_CDA102568_11_R8A_GENERIC_EUROPE_2Top Sony Forums