CBR750 internet issue after power outage

Question

I had a CBR750 modem/router installed in a new home with Xfinity service and approximately 2 months ago we had a power outage. Long story short, the issue was found to be the router but Netgear would not replace it because it was out of warranty. I found another used replacement CBR750 but this time I put it on an UPS to prevent any future issue to any of the internal electronics. Well hence here we are with another unit not functioning after a power outage. I have seen countless blogs with other experiencing the same problem but no resulting resolution from Netgear. I have tried everything with no avail (reboot, firmware, etc.). Has anyone figured out what could be happening to these units and how to remedy the problem?

FURRYe38 · Answer

What Firmware version is currently loaded?Please post a copy and paste of the modems connection status and event log page.https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-routerhttps://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-router
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Any RBS deployed? If so how many?&nbsp;RBS firmware loaded please.&nbsp;
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Any front LED indications seen when this happens?&nbsp;
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If the CBR is on a UPS, then would not be a CBR issue if the UPS maintained power to the CBR unit.&nbsp;
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Tweete18 · Answer

The 3 LEDs from the left to right will go solid but the last one will not lock on the Xfinity signal. I had a tech come and check the signal and everything checked out okay. I am actually using a leased Xfinity modem/router right now. This is the same behavior from both modem/routers that are no longer working. There is one RBS deployed. I am currently out of town but should have the firmware and event log for you once I return.

FURRYe38 · Answer

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Ok, Will need to see those logs after the CBR is back online with the ISP.&nbsp;
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FYI: There as been ISP infrastructure changes so this may play a roll in this as well:
https://community.netgear.com/t5/Cable-Modems-Gateways/ComCast-XFinity-Next-Generation-ISP-FAQ/td-p/2355933/jump-to/first-unread-message
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Safe travels.&nbsp;

Tweete18 · Answer

I did not have a backup config file to restore from. I downloaded the most updated fw version and then installed from my laptop. I tried to reactivate from the app and a Xfinity technician tried as well. It was narrowed down to the issue being the cbr750 but after troubleshooting, netgear said they couldn’t do anything to fix it.

FURRYe38 · Answer

Any progress on this?&nbsp;
Checking to see if you were able to get the CBR back online and if you did, were you able to set the event and cable connections log data?&nbsp;
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Wondering if you might have a friend, neighbor or maybe a family member that you could take the CBR to and connect there to see if it works there?&nbsp;
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Tweete18&nbsp;wrote:I did not have a backup config file to restore from. I downloaded the most updated fw version and then installed from my laptop. I tried to reactivate from the app and a Xfinity technician tried as well. It was narrowed down to the issue being the cbr750 but after troubleshooting, netgear said they couldn’t do anything to fix it.
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CBR750 internet issue after power outage

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