I have both x96s (2g and 4G) and tested the firmwares. The 2g worked with android 8.1 and 9.0 firmwares (the 8.1 i think the folders are inverted, the sdcard folder is the usb folder).
My 2g x96s worked but was somewhat strange and slower with android 9.0, so returned to 8.1.
The 4G x96S already came with android 9.0 and work nice.
Here is the link:
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