Which firmware is most recent?

I have purchased a Yeastar TA800 FXS gateway.  It came with firmware version installed on it.  The latest firmware on the Yeastar website for the TA800 is version, which is dated 2017-05-05.

Which firmware version is the latest or most recent?  If the is the most recent, then I need a primer on the Yeastar firmware version numbering schema.


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