I received my NFB 28.38 today and had absolutely no issues with the file you linked via USB/Optical. How are you connecting the NFB to your PC? Is it the Amanero? are you running Windows 10? What's there to update when the product works as intended? Kingwa has already stated the units have gone through extensive hours of testing before being shipped. If you really plan on upgrading in the near future then it might make more sense to go for the separate NFB1 AMP/DAC instead of the AIO.