Resetting factory settings
Perform this procedure if the display is abnormal or if operations cannot be performed.
Various settings are reset to the factory default values. Make settings again.
Turn off the power using 
.
.Press while simultaneously pressing M-DAX and ZONE2 SOURCE.
while simultaneously pressing M-DAX and ZONE2 SOURCE.Remove your fingers from the two buttons when “Initialized” appears on the display.
Before restoring the default setting, the “Save” function of the web control function can be used to store the various settings of the unit. link
However, account information for network content and information on registered favorites cannot be stored.