Yeah I know how to enable USB DAC mode. I installed drivers from iBasso website and also tried those drivers posted on of the first pages in this thread. USB not recognized error is shown when USB DAC is activated (photo taken from Twister6 review):

Hello Everyone, I just bought DX160 and I'm struggling to connect it to my PC with Windows 10 as USB DAC. When I want to transfer files or charge DAP is working without any problems but when I try to use USB DAC in Mango - PC is showing information that USB connection is not recognized. I...