[Mr.HiAudio]

This is my setup.

perhaps we had the latest version of Z80 that does not support USB DAC and reverse power in general you also have a tongue of protective film on the bottom, and I had it on top

 

[tudorels]

perhaps we had the latest version of Z80 that does not support USB DAC and reverse power in general you also have a tongue of protective film on the bottom, and I had it on top

 

[tudorels]

I think is only one version of this player. And it's about android version 8.1
https://streamable.com/mu8ek4

 

[Mr.HiAudio]

I think is only one version of this player. And it's about android version 8.1
https://streamable.com/mu8ek4

this function does not work for me and the user above. and I also asked the seller - he told me that this function(external USB-DAC) doesn't support
Also see a USB tester:

 

[tudorels]

this function does not work for me and the user above. and I also asked the seller - he told me that this function(external USB-DAC) doesn't support
Also see a USB tester:

Do you have android 8.1.0? This feature is up to android version. If you don't have restricted custom ROM by seller it must work by setting in developer options. I'm sorry it's not working on your devices. I buyed the player from AliExpress and before ordered I asked seller if it supports USB audio and the answer was no, but when I tried it works.
What do you measure? I don't see the player to play something. Is in the background?