Having the same issue in Denver thanks to ISP "upgrades" from comcast. Just messaged Blanca_O . Keep me posted on progress please.

No resolution to date. Xfinity has confirmed its a netgear problem. Netgear also confirmed it was a problem on their end (been dealing with it since October) that their engineering team is working on. Netgear said that it may take "some time" for their engineering team to resolve the issues. I am not optimistic. I would recommend contacting netgear to request a refund. They have offered me a replacement (will be my second one) but they are extremely difficult to get in contact with. If I dont have a working replacement within a few days I am strongly considering contacting the attorney general of Colorado about a false advertising complaint against netgear for claiming the modem works with xfinity on the packaging.

I know the 800mbps tier was recommended but I wouldn't go down that route. Ended up costing my an extra $50 per month from XFINITY and same problem. ISP has cost me probably $1K and more than 40 hours of BS calls through this whole fiasco.

Look at all of these posts about CBR 750 having problems with Xfinity. Has anyone figured out a solution? Netgear support has no idea whats going on and refuses to give me a refund for the device. I am desperate. They are also deleting a lot of posts off of the forum.

The problem is not with the router side its with the modem side.

These modems do not work with comcast currently.

CBR750 not working with Comcast/XF

30 Replies

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cshep5528
Star
Dec 24, 2022
So after 2 hours on the phone with Xfinity they told me that the orbi 750 doesn't work with 1gb internet. I downgraded to 800 mbps. Now I am stuck paying $30 more per month for slower internet. I hate comcast.
- Cinemagic310
  Guide
  Feb 04, 2023
  thats not true because I have it and it works fine! Download speeds are tyoically 820 to 1134
cshep5528
Star
Dec 28, 2022
So the 800 mbps failed the same as the 1G did. Arguing with comcast for a refund as I write this.

Hopefully Blanca_O can figure this out quickly.
cshep5528
Star
Jan 06, 2023
Another 5 hours on the phone with xfinity and netgear this week. Router cut out 3 times. Does anyone know how to formally request a refund? I am also planning to submit a request with the state AG for false advertising.
- FURRYe38
  Guru
  Jan 07, 2023
  We need the following from you:
  
  PM me the MAC address and serial number from the CBR.
  
  Please enable debug logs on the CBRs web page under 192.168.1.1/debug.htm
  
  Enable WAN/LAN capture as well.
  
  Please post the following here in the forum:
  
  FW version on the CBR.
  
  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-router
  https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-router
  
  The ISP made changes to there speed tier program with out letting users know. They removed support for 1Gb and split the tier to 800Mpbs and 1.2Gb which seems that in some areas, the ISP is not supporting the CBR on the 1.2Gb tier. So some of this is ON the ISP. The CBR had been working fine up to this point until the ISP made changes. SInce the CBR only has 1000Mpbs LAN ports, doesn't make sense to have the 1.2Gb speed since you'll never see much over 900Mbps on the LAN side thru the CBR750. The CBR works as advertised on the 800Mbps speed tier.
  
  cshep5528 wrote:
  
  Another 5 hours on the phone with xfinity and netgear this week. Router cut out 3 times. Does anyone know how to formally request a refund? I am also planning to submit a request with the state AG for false advertising.
  - FURRYe38
    Guru
    Jan 11, 2023
    Please post a copy and paste of the modems connection status and event log page from the CBR.
    
    cshep5528
FURRYe38
Guru
Jan 24, 2023
There we go...

I see a few channels that are a bit over the power range recommended by NG:

https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router

I'd ask the ISP to reduce the power on the line a bit. Ask about a inline attenuator to help here. Up link is 5dbm so if they can get the down link around same, would be good.

Have some Correctables but not horrible. Be sure to check all coax cable fittings and ensure they are screwed in to the jack in back well and snug. Be sure coax line is of good quality RG6 cable. Check for any coax line splitters as well.

Also what FW version is loaded on the RBS and CBR?

There is newer FW for both if you haven't already loaded them:

https://community.netgear.com/t5/Orbi-with-Built-in-Cable-Modem/New-CBK750-Firmware-Version-4-6-14-4-Released/td-p/2287231/jump-to/first-unread-message

Be sure to update the RBS first then CBR lastly.

Are you still on the 800Mbps speed tier from the ISP?
- cshep5528
  Star
  Jan 24, 2023
  Thanks FURRYe38 I will call comcast when I get a chance. One of the steps their tech took was to move the Modem directly to where the coax lines come into the house so we should be good there. I am still on 800 speed with them, yes.
  
  As for firmware see below:
  - FURRYe38
    Guru
    Jan 24, 2023
    Where is the CBR located? Hopefully on main level or 2nd level of the home. Basements are not recommended.

Forum Discussion

CBR750 not working with Comcast/XF