Mine is 2020-07-30, so a bit older than yours. It did have an older version than that originally but was updated last August.
My home WLL is the same, but sounds like there may be a newer version. Unfortunately I'm not aware of any way for the user to update the firmware beyond: (i) Doing a full power cycle on the WLL; as it reboots it should apparently look to see if newer F/W is available and download/install that; (but I've never checked to see if this works as described); or (ii) for a F/W update to be pushed individually from Davis, but this mechanism is usually considered a last resort and - as you might imagine - not encouraged.
All that said, I'm guessing that any later version than 2020-07-30 is only a very minor update and possibly inconsequential for most users. Certainly, I'm not aware of any significant issues that might be fixed by newer firmware.