Download Android Jelly Bean 4.2.2 Stock Firmware for Vido M7 / YuanDao M7 tablet from here or here. Download another Vido / YuanDao firmwares from here.
Update file name: M7-4.2-20141107-ZZ-V71_V1.1.1
Archive size: 350 MB
Model: Vido M7 / YuanDao M7 tablet
Model: Vido M7 / YuanDao M7 tablet
Platform: Intel-Atom-Z2520