Flash with A2uploader and these files:

1. W595_R3EA037_MAIN_GENERIC_LD_RED52
2. W595_R3EA037_FS_S-CENTR-AFR_RED52
3. K850i_1201-0150_R11A_GENERIC_S-CENTR-AFR

OR

1. W595_R3EA037_MAIN_GENERIC_LG_RED52
2. W595_R3EA037_FS_S-CENTR-AFR_RED52
3. K850i_1201-0150_R11A_GENERIC_S-CENTR-AFR

OR

1. W595_R3EA037_MAIN_GENERIC_LT_RED52
2. W595_R3EA037_FS_S-CENTR-AFR_RED52
3. K850i_1201-0150_R11A_GENERIC_S-CENTR-AFR