Did you check out the example that can be imported in Automation Studio (via Toolbox - Samples - Library Samples - Library - AsUSB)?
I’ve tested the 2nd example quickly (the ST code, LibAsUSB2_ST) on a X20CP0484-1 and this works out of the box. The tag I am using is a 5A9000.42.
As you can see I also occasionally some statusses 60 although a tag was present but nevertheless, the tag gets read properly. Hope this can help!