Fiio M21 Multi-function button support

[regorxxx]

Have you checked if an issue already exists for this feature request?

• Nobody else has requested this feature before

What feature would you like added?

Fiio m21 devices have a configurable multi-function button (KEY_TV) which doesn't seem to be recognized at all by app, even in expert mode.

Related info:
WheresWaldo/FiiOat#9

App version

4.3.0-foss 257

Device model and manufacturer

Fiio m21

Extra info

• My device is rooted