Download Android Nougat 7.1.2 firmware for MX9 Pro TV Box from here or here. Download previous firmware from here. Download Rockchip Driver Assistant v4.4 from here and download Rockchip Batch Tool v1.8 from here.
Archive: 2124814 MX9 PRO TV Box ROM firmware pack
Archive size: 581 MB
Platform: Rockchip RK3328 / RK322H
Image name: a9s_rk3328_d4_rtl8723_20180705_r1(mx9pro 隐藏kodi无插件).img
FW version: 7.1.00
Boot version: 2.44
Model number: MX9Pro.01.d4
Build number: rk3328_box-userdebug 7.1.2 NHG47K eng.foxluo.20180705.113322 test-keys
Inside archive: firmware + RKBatch upgrade and Tool (OTA upgrade methods + OTA升级操作步骤 + PC upgrade methods + PC升级方法 + 瑞芯微量产工具V1.8)
SDK version: RK30_ANDROID7.1.2-SDK-v1.00.00
1. Prepare a computer, your device and a working USB cable.
2. Do remember to backup your important files in your TF card or your PC in case of the data lost which might be happened during the updating process.
3. Do follow the updating operation guide and operate correctly.
4. Do NOT do any operation on your device during the device updating process in case of updating failure.
5. Other cautions when needed due to the specific updating process or product.
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.