Download Android 7.1.2 stock firmware for MAGICSEE N6 Max TV Box from here, here or here. Download previous firmware version from here. Download Rockchip Driver Assistant v4.4 from here and download Rockchip Batch Tool v1.8 from here.
Archive: N6 MAX RK3399 update 20190115
Model: MAGICSEE N6 Max TV Box
Image file size: 766 MB
Platform: Rockchip RK3399 / RK330C
Image name: N6 MAX RK3399 update 20190115.img
FW version: 7.1.01
Boot version: 1.15
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.