Download latest Android 7.1 stock firmware for M96X-II Mini TV Box from here, here or here. Download previous firmware from here. Download Amlogic USB Burning Tool v2.0.8 from here or download Amlogic Burn_Card_Maker v2.0.2 from here.
Archive: M96X-II MINI 2018.01.31
Model: M96X-II Mini TV Box
Image file size: 651 MB
Platform: Amlogic S905X
Image name: M96X-II MINI 2018.01.31.img
Inside archive: firmware
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.