I just purchased and installed my new DAC. When I attempted to update Raspbian Buster, I learned I need to install Raspbian PI OS which I did. Now, when I turn on my PI I get a loud pop. I also get no sound when streaming or using when using VLC (a default app within RPI OS) to play files stored on an external SSD. It might be important to note i had none of these issues prior to switching my DAC from Dac+ Pro.