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CM3000 stopped working
My CM3000 stopped working.
I have a CM3000 cable modem, purchased Sep 11, 2024. Yesterday it stopped working. The second light down from the top (lightning) is the only one that is active, sometimes blinking, sometimes solid.
I called my internet provider Xfinity. They went through the diagnostic tests on their side and determined that everything on their side was working properly. They sent multiple system resets, and the CM3000 did acknowledge via the lights changing when the reset was sent as the light indicators changed from the bottom up for about a second. And then the second indicator down (lighting) either blinked slowly or stayed solid.
I have a previous cable modem from Arris, an SB8200, that I had upgraded from to the CM3000. While still on the phone with Xfinity technical support, I disconnected the CM3000 and connected up the Arris SB8200. After Xfinity provisioned the SB8200, sent a reset, I was up and running.
Prior to swapping over to the Arris cable modem, I had disconnected power to the CM3000 several times.
LED light status:
only lightning blinks slowly, and sometimes is solid
What are the troubleshooting steps that you have done so far?
I called my internet provider Xfinity. They went through the diagnostic tests on their side and determined that everything on their side was working properly. They sent multiple system rests, and the CM3000 did acknowledge via the lights changing when the rest was sent from the bottom up for a second. And then the second indicator down (lighting) either blinked slowly or stayed solid.
I have a previous cable modem from Arris, an SB8200, that I have upgraded from to the CM3000. While still on the phone with Xfinity technical support, I disconnected the CM3000 and connected up the Arris SB8200. After Xfinity provisioned the SB8200, sent a reset, I was up and running.
Internet Service Provider:
Xfinity
Firmware Version of the cable modem:
Hardware Versions
1.01
Cable Firmware Version
V6.01.03
CM Certificate
Installed
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FYI, For those that haven't been rolled back, please have your CM3000 series modems online by this Sunday. Seems that ISP maybe planning to roll back FW back to prior working version for those effected with v6 FW on CC/XF ISP.
Hi,
OK, I performed the reset using the paper clip via the Reset on the back of the CM3000. Actually several times.
I called Comcast my internet provider and had them provision the CM3000. They did. They ran diagnostics tests. They all passed.
However, the CM3000 still only has he Lightning indicator blinking and never comes up. This is its only behavior.
This sounds like a dead CM3000.
Most likely having to do with newer FW on the modem. You might make contact with NG support.
The LOG was extracted after I had reconnected and provisioned the SB8200 cable mode. I plugged the CM3000 in and logged into it without a cable connection, and downloaded/copied the log to a spreadsheet.
Firmware Version of the cable modem:
Hardware Versions
1.01Cable Firmware Version
V6.01.03Lots of criticals. Is this log from the CM modem when it was online?
What Firmware version is currently loaded?
Please post a copy and paste of the modems connection status and event log page again.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-routerTry a 30-30-30 reset the CM modem with it not connected to the ISP coax cable, then after the last 30 button press is released. Connect it up to the ISP cable coax line and see if the ISP can re-associate it to there network. Then take another Event log and also be sure to capture a cable connections data page log as well:
Also, attached is a screenshot of the Event Log. This failed on May 28th and wouldn't recover since then.
