Download Android KitKat 4.4.2 Stock Firmware for Vido M82 / YuanDao M82 AZ tablet from here or here. Download previous firmware version from here. For ZZ model download the firmware from here.
Update file name: M82-4.4-20141226-AZ
Archive size: 567 MB
Model: Vido M82 / YuanDao M82 tablet AZ model
Platform: Mediatek MT6582
Project: esky82_tb_cn_kk
Config_version: V1.1.1
Baseband: MT6582_S00_MOLY_WR8_W1315_MD_WG_MP_V39_P1_1_wg_n
ADS HERE !!!