Download Android Jelly Bean 4.2.2 stock firmware for K-Touch C986T+ smartphone from here or from here.
Archive name: c986t+ fw
Image file: 972017_8902_V0868.zip
Archive file size: 301 MB
Model: K-Touch C986T+ smartphone
Platform: MediaTek MT6572
Project: tianyu72_t_cmcc_lca
Config_version: V1.1.1