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I have, it works fine
Later versions of the D50 do not display bit depth. Has nothing to to do with firmware, just a running design revision that Topping chose to implement.
I'm not sure what firmware version I am on, but I am on the latest Windows Drivers (comes as a D50s set of drivers, but works with my D50).
Do you have the link to the details of that? What is the reason for this design change and what exactly has been changed in the hardware?
It is official. Soon will have the matching Topping A50 headphone amplifier. It would look great on top of the D50s DAC. I hope it measures at least as well as JDS labs Atom. I am attaching a screenshot of the email.