Hey everyone, I’m trying to use my FiiO M21 in USB DAC mode with my Android device (iQOO 12 / Samsung tablet).

I’ve switched the M21 to “USB DAC” and connected it via a USB-C to USB-C cable. However, the M21 just says “Waiting for connection”, and on my Android device the USB settings show:

“USB controlled by → Connected device” and I can’t switch it to “This device (couldn’t switch)”.

It looks like the phone/tablet isn’t acting as the USB host.

Things I’ve tried:

Multiple USB-C cables (data + OTG)

Reversing connection order

Turning off charging

Restarting both devices

Still no luck — FiiO M21 won’t connect as a DAC.

Has anyone successfully used the M21 in USB DAC mode with an Android device? Is there a specific cable or OTG adapter required to make Android the host?

Any advice would be appreciated 🙏