Read Here to debrand first : Flash K800 CID53 with K810 software CID53 (for begginers) - Top Sony Forums and use these files :
MAIN : W380_R10CA001_MAIN_GENERIC_LE_RED53
FS : W380_R10CA001_FS_C_ASIA_RED53
custpack : HB1-06_Gen_CDA102568_7_R11A_GENERIC_C_ASIA
and to patch unlock, read here : Patching CID53 (DB2020)DB2010,2012 - Top Sony Forums
better give it a try though it's a pnx5230 phone