Marantz NR1604 Model Information page 15

Upgrades/Updates (2 of 2)
Firmware:
This unit has the ability to update its firmware over the internet if so is selected by the user. When connected to a network via Wi-Fi or Ethernet, the AVR
searches automatically for new updates and if any is found, a message appears on the screen for approx. 40 seconds with the options of updating the
firmware: "NOW", "LATER", or "IGNORE". Note: This feature of displaying the update message, can be disable from the "Setup" menu
(Setup/General/Firmware/Notifications/Update or Upgrade/Off).
If the update process is interrupted, "Update retry" appears on the display and the unit tries repeatedly to continue the update until it either reconnects and
picks up where it left off and continue the update process or times itself out after trying several times. When the latter occurs, one of the following messages
will appear on the screen.
Connection fail Download fail Updating fail Server is busy Login failed
To Check for Firmware Update from the Marantz server when the unit is connected to the internet via the Ethernet port (When Firmware Notification is
turned off).
Press "SETUP" and select "GENERAL" and then select "FIRMWARE" followed by "UPDATE" and finally, select "CHECK FOR UPDATE".
Note: This will also check the time it will approximately take to complete the update.
To check to see if an update or upgrade is available for your NR1604 and also to download the latest version of firmware, click on the following link:
http://www.us.marantz.com/us/support/pages/productupdates.aspx
Note: A list of "Recent Updates/Upgrades is also available at this link"
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Upgrades/Updates (1 of 2) Specifications – Audio Section