Use A2uploader from here: http://www.topsony.com/forum/a2uploader-f63/a2uploader-cid53-t19300.html#post123483 and these files:
1. T700_R3EA037_MAIN_GENERIC_RM_RED52
2. T700_R3EA037_FS_ADRIATIC_RED52
3. K850i_1201-0083_R11A_GENERIC_ADRIATIC (do not worry about it for K850, because T700 use same custom file).