To restore the default factory settings of your Quintet just follow the 4 steps below:
Power up your Quintet while holding the "HARMONY MUTE" key pressed for approx. 2 seconds
Select "Reset sys param" with the datawheel. (if you just want to restore the factory presets choose "Clr all presets" instead)
Confirm the reset procedure by pressing the "HARMONY MUTE" key again. The display should now display "Clear/Reset done"
The next time you turn on the Quintet, it will start with its restored default factory settings.
Attention: Please note that the reset procedure will delete all user presets stored in the unit, so don't forget to back them up.