Once you have downloaded the Android 7.1 stock firmware, follow these steps to install it on your MXQ Pro 4K TV Box:
The most reliable way is to open the box and look for the name printed on the main processor (e.g., ) and the board version number (e.g., MXQ-4K-3229XD2 2. Firmware Download Sources download android 7.1 stock firmware for mxq pro 4k tv box