Download Android Nougat 7.1.2 stock firmware for MXQ Pro+ TV Box from here, here or here. Download previous firmware from here. Download Android Lollipop 5.1.1 stock firmware for MXQ Pro+ TV Box from here. Download Amlogic USB Burning Tool v2.1.6 from here or download Amlogic Burn_Card_Maker v2.0.2 from here.
Archive name: MXQ PRO+ S905X 2GB/16GB 4K TV BOX Unrooted Firmware 20180201
Image: s905x013.MXQ_PRO+_unrooted_2G(16)_HS2734A_100M_7.1.2018.02.01.11.32 .img
Device: MXQ Pro+ TV Box 2GB/16GB
Firmware: Android Nougat 7.1.2 stock
Archive file size: 670 MB
Platform: AMLogic S905x
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.