Download Android Oreo 8.1 firmware for MX9 Pro TV Box from here or here. Download Android Nougat 7.1.2 firmware for MX9 Pro TV Box from here. Download previous firmware from here. Download Rockchip Driver Assistant v4.4 from here and download Rockchip Batch Tool v1.8 from here.
Archive size: 581 MB
Platform: Rockchip RK3328 / RK322H
Image name: update.zip
FW version: Android Oreo 8.1.0
Model number: MX9 Pro TV Box 4GB RAM + 342GB ROM
Build number: Android/rk3328_box/rk3328_box:8.1.0/OPM6.171019.030.B1/foxluo11131635:userdebug/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.