My coworker got a Raspberry Pi 3, 4, and 5, along with the HiFiBerry DAC2 ADC Pro sound card hat and a case to put it all in. The hat alone was $75, and I don't even want to know the total cost of everything else he bought. We installed a 128GB memory card with the newest Raspberry Pi OS downloaded from the Pi website. We did everything: editing config files, going in as root, editing stuff, trying everything on your website, editing the config file to turn off HDMI sound—just a ton of absolutely ridiculous stuff to try to get it to work. We tried all three versions of the Raspberry Pi hardware as well.
There are no definitive drivers or installers. My guess is you depend on the Raspberry Pi OS to load most of it by default and use some kind of mumbo jumbo homebrew code to make it kind of haphazardly force it to work. Then, when Raspberry Pi updates, it leaves your device with so many variables that only a pro user who knows everything about the OS might have a chance, if they are lucky, to get it working. I'm just being honest, not trying to put your company down. I feel that you guys need to STOP, take a step back, and look at what you're doing. Work on developing software and driver packs with 6 or fewer clicks to auto-detect the sound card and install it, with some tools to test and make sure the sound card is working. If the sound card fails to install, have it provide some useful information on WHY.
Frankly, the HiFiBerry and Raspberry Pi platform is a complete joke, basically a kid's toy dressed up to look serious. In this day and age, if you can't just snap it together, load the OS, load the driver, and have it just work, then it's basically a waste of time. I told my coworker to give up on it, send the HiFiBerry and anything he can back, and get his money back. I can build him a basic PC with a Creative sound card that will run circles around this little tinker toy product.