Firmware—the internal control and processing software in the Audiophilleo—is
easily upgraded by playing a special .WAV audio file that contains the new code.
All you need to do is configure the computer operating system and media player to not resample and the volume to 100%.
Firmware upgrades can be particularly useful for the Audiophilleo1 because of
its extensive feature set and display; new controls and functions, variations on existing
ones, as well as product improvements are readily installable in the field.