Download Android 4.2.2 Jelly Bean stock firmware for Lenovo A708T smartphone from here or from here.
Archive name: Lenovo A708T FW
Image: signed_2737_a708t_tm
Archive file size: 233 MB
Support: Mediatek MT6582
Project: lcsh82_wet_jb5
Build number: lcsh82_wet_jb5-user 4.2.2 JDQ39 82 release-keys