There are many variations of the MXQ board (e.g., all black vs. other clones); firmware for one may not work on another and could potentially brick your device .
Place the firmware and recovery files onto the root of the SD card. Toothpick Method: Insert the SD card into the powered-off MXQ box. Use a toothpick or paperclip to press and hold the reset button (usually hidden inside the AV port). Connect the power cable while holding the button. Mxq Amlogic S805 Android 5.1.1 Lollipop Download