Use A2uploader and these files:

1. W890_R1EA033_MAIN_GENERIC_AK_RED52
2. W890_R1EA033_FS_S-ASIA-LEVAN_RED52
3. K850i_1201-0144_R11A_GENERIC_S-ASIA-LEVAN (do not worry, because K850 and W890 use same custom pack).