Download Android Jelly Bean 4.2 stock firmware

Download Android Jelly Bean 4.2 stock firmware for E-Ceros Vision tablet from here, here orhere. You'll find instructions for firmware flashing inside the archive. If you want to upgrade it to KitKat 4.4.2, read this.

Archive： E-Ceros Vision stock firmware 

Model: E-Ceros Vision tablet (first generation CVYF-104108, not sure if works on the newE-Ceros Vision S)
Image file size: 246 MB

Platform: Rockchip RK3188
OS: Android Jelly Bean 4.2.2