Download Android 7.1.2 stock firmware for Qintex Q912 TV Box from here, here and here. Download previous firmware from here. Download Android 6.0.1 stock firmware for Qintex Q912 TV Box from here. Download Amlogic USB Burning Tool v2.0.8 from here or download Amlogic Burn_Card_Maker v2.0.2 from here. Video Tutorial here: How to easily update firmware on Qintex Q912 TV Box
Model: Qintex Q912 TV Box
Image file size: 972 MB
Platform: Amlogic S912
Inside archive: firmware + factory_update_param.aml + Q912 How to upgrade the-system .xls
Build number: Amlogic/q9377/q9377:7.1.2/NHG47L/20170801:user/test-keys
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.