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Enter the email address you used to create your account. We will email you instructions on how to reset your password. : If the update fails and you lose

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: If the update fails and you lose the On-Screen Display (OSD), try holding the Power button for 5 seconds to resume .

: Updating may reset your custom Audyssey calibrations or input assignments. Write these down before starting.

If no update is available and your receiver works, you can work around issues:

This is the standard procedure if your receiver is connected to your home router. "Legacy" Denon AVR Firmware. - Linus Tech Tips

To understand the importance of updating, it helps to look at the specific updates the AVR-1912 received during its support lifecycle. Denon released several key updates that transformed the unit.