Updating Marantz firmware via CISCO 1921 Router

I have a CISCO 1921 Router running IOS Version 15.0(1r)M15. There are two Marantz 7701 pre/pro processors on the LAN side of this router. Marantz makes firmware updates available through the internet. All other network services seem to run without any issues on the 7701 except firmware updates. We can stream Pandora audio, various internet radio stations, and receive notification of firmware updates available just fine. However, if we try to actually update the firmware, the Marantz 7701 connects to the update server, then hangs trying to do the update and has to time out before I can try to do the update again. There is something in the way that Marantz uploads the firmware update that is getting blocked by the CISCO 1921.
If we put an HP ProCurve switch between the CISCO 1921 and the FIOS ONT and assign a routable IP address to the Marantz, the firmware update works just fine. If we attach the Marantz to an Apple Airport Express that is NATted/routed to a COMCAST cable modem connection the firmware update works just fine.
This is a long shot, but does anyone happen to have a Marantz 7701 attached to a CISCO router that successfully allows the Marantz firmware updates on the LAN side? If so, did you have to change any of the "default" IOS settings so the update takes place?
I tried to get some info from Marantz on how they do the firmware update, but the folks that answer the phone didn't have access to any protocol or handshake information.
Thanks for any insight or help on this.

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How do I update the Firmware on the Quantum Router?

So the Quantom router is missing a bunch of features the old action tech router had. Advanced filteringis gone, I am hoping a firmware update would bring it back. I go to look to upgade or check for a firmware update and that isn't there either.
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Sent from Cisco Technical Support iPad App

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Hi,
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02-06-2010
RM-437
(c) Nokia E63-1 (308.06)"
I'm an advanced computer and mobile user and can perform specific system tasks. If there is any solution to the above issue, please let me know.
Thanks in advance.
Regards,
Amit Kumar Singh
Solved!
Go to Solution.
Attachments:
Installation file validation.png ‏127 KB
Preparing to install.png ‏131 KB
Install Screen.png ‏128 KB

Well, it was disheartening to see that Nokia didn't provide new NSU direct link. Had to get an older version from non-Nokia site. Though after install it updated itself to a newer version but would've really appreciated if Nokia would've provided NSU as official download.

Regarding non updating of E62 firmware via NSU.

As per nokia website,The E62 has the following firmware that can be installed to the phone.
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E62 RM-88 2007-05-21 2.0618.06.17 EMEA
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E62 RM-88 2007-07-17 3.0633.09.13 EMEA
E62 RM-88 2008-01-29 3.0633.31.19 EMEA
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What is defference between updating Firmware via P...

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Hello everyone!
For starters I am no Cisco guru but at least find my way around a few things here and there.
I work as the IT dude for a company with two branches at different geolocations.
Our local network infrastructure at both HQ and branch offices comprise a Cisco 1941 Router and SF 300 24P Managed switches which hooks up our servers, workstations and VoIP phones.
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Hi Ash,
Thanks for the assistance.
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