This firmware is for X96 S400 TV Stick with Allwinner H313 as CPU. BTW, you can buy X96 S400 TV Stick from Banggood.com for a very good price.
Archive name: X96_S400_20201228-1412
Archive file size: 725 MB
Model: Sunnzo X96 S400 TV Stick
Platform: Allwinner H313
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.