Denon Avr E300 Firmware Update -

Denon no longer actively develops new firmware for the E300, as it is a discontinued model. The last official major update was released around 2015. However, if you own a unit that has never been updated, you may be running a version from 2013. These older versions lack critical stability patches.

While pressing the STATUS and TUNER PRESET CH – buttons on the main unit simultaneously, power on the unit. Denon Avr E300 Firmware Update