I just purchased a DAC2 HD for my RPi 3b running the latest version of HifiBerryOS. However, I have problems configuring it.
On the HifiBerry page, it shows "Dac + Zero...", which is the first strange thing, and the volume control cannot be moved from zero (muted). Of course, there is no sound...
I did some reading and tried adding a /boot/config.txt file with
dtoverlay=hifiberry-dacplushd (with and without force_eeprom_read), but that just causes the system to reboot endlessly... Am I doing things right? I find it very strange that I had to create the config.txt file, since /boot/ contains no files.