How to Factory Reset Denon AVR-1910 7.1 HDMI Home Theater Surround Receiver 

How to Factory Reset Denon AVR 1910 7.1 HDMI Home Theater Surround Receiver
Press and hold the right and then left buttons on the surround mode, then turn off the receiver, turn it on again and you will see the front display flickering. Release the the surround mode buttons and your receiver will be reset to factory settings.