I think the HONG KONG firmware is not related to the problem, as I am now using the W580_R8BA024_MAIN_GENERIC_LA_RED52.mbn + W580_R8BA024_FS_HONG_KONG_RED52.fbn combination with the sim-lock patch without any problem, there are different .mbn with the same R8BA024, maybe the patch wasn't generated by the same .mbn file eventhough it shows R8BA024