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I have a Denon avr-991 that I ran a firmware update on. The last file in the update called Ether IMG was being downloaded with 4 minutes to go and then the receiver restarted. It seemed as though the update had completed, however, every time I turn the power on, the receiver displays "Please Wait Update Retry". I have tried the micro-processor reset with and without the cat5 plugged in and neither attempts solved the problem. The receiver seems to function for the most part, however, I am unable to navigate through the menus into the firmware update page and the video display of the menu freezes a few seconds after the unit is turned on. How to I reset the firmware update process?