Download Android Pie 9.0 stock firmware for Magicsee N5 NOVA TV Box from here, here or here. Here you can read about the unboxing of Magicsee N5 NOVA TV Box 2.4G Voice Remote with Air Mouse. Download Rockchip Driver Assistant v4.5 from here and download Rockchip Batch Tool v1.8 from here.
Archive size: 840 MB
Model: Magicsee N5 NOVA TV Box
Platform: Rockchip RK3318 / RK322H
Image name: RK3318-9.0-MGCTV15020190805.img
FW version: 9.0.00
Boot version: 2.49
Inside archive: firmware + Rockchip upgrade Tools (AndroidTool_Release_v2.61 + DriverAssitant_v4.7)
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.