After installing, right-click the speaker icon → "Sound" → your FiiO device → "Advanced" → uncheck both "Allow applications to take exclusive control" and "Enable audio enhancements." Yes, counter-intuitive. But it works. Got a specific FiiO model? Drop the name in the comments—some older units (like the E17) have quirks.
Do you need it? Is it safe? Let’s clear up the confusion. In short, it is a Windows USB Audio Class 2.0 driver (specifically from Thesycon, customized by FiiO). Your computer knows how to play Spotify out of the box, but for bit-perfect, exclusive-mode playback (like in Tidal, Qobuz, or Foobar2000) above 96kHz, Windows needs a little help. fiio driver
If you’ve just unboxed a shiny new FiiO DAC (like the K11, K7, or the iconic E10K), you’ve probably landed on a page that asks you to download a "FiiO Driver." It feels like a 1999 time warp. After installing, right-click the speaker icon → "Sound"