Download Android Jelly Bean 4.2.2 stock firmware for Himedia H7 TV Box from here or here. Download another Himedia firmware from here.
Archive name: update_quadcore_H7 fw
Archive file size: 313 MB
Image file: update_quadcore_H7.zip
Firmware: Android Jelly Bean 4.2.2 stock firmware
Model: Himedia QH7 TV Box
Build number: softwinners/H7/H7:4.2.2/HMD-1.0.5/20140620:eng/test-keys