Hi pieronip!
I have an iFi ZEN DAC V2 and a Windows10PRO PC. The current iFI Audio driver is from 2018. It allows for all the 3 modes (WASAPI, ASIO Kernel) to work on Audirvana Studio, however, the DAC is not reporting correct information about bitrates.
After several tests, i have removed the iFi Audio drivers and am using the standard “USB Audio 2.0” from Microsoft. It is reporting correct information on all tracks and also detecting the DAC correctly as a MQA Decoder (with the iFi Audio driver i have to force on Audirvana Studio the MQA Decoder option). The only downside of using the Microsoft generic drivers is the loss of the ASIO mode. I can live with that, so i am using Kernel mode.