Netgear CAX30 Modem Firmware Update Causing Internet Connectivity Issues

Just got off the phone with Netgear.  They are going to have to walk you through changing the firmware back to the one before the update 4-5 days ago.  1-888-NETGEAR

I experienced similar issues after rolling back the firmware. Some of the issues with the new firmware were related to the traffic meter feature somehow. I did two things and saw my issues resolved afterwards: 

1) Perform a factory reset on the router using the reset button. Netgear recommends a factory reset after every firmware update. 

2) Once you have set it back up, head to the Traffic Meter settings in either the web console or the nighthawk app. Enable. Confirm. Disable. Confirm. 

If possible, grab two devices and use iperf to test the local connection speed between them. This would rule out there being issues with the router's ability to transmit. I personally added a 70db point-of-entry MoCa filter onto the back of my router to go with that one that's outside. Netgear's speed test is interesting, as I get similar speeds from that specific test, but my individual devices all reach near the speeds you would expect. (S21 Ultra on WiFi 6 600+, Surface Pro 6 250+, Fire Stick 4k Max 350+) 

I believe I have resolved all of the issues that were affecting my internet connection, including disconnection, instability, and slow speeds. Here is what I did to fix the problem:

I downloaded an older firmware version, 1.4.11.2, from the following website, as my previous firmware version was 2.1.x:
https://www.netgear.com/support/product/cax30.aspx#download

I logged in to routerlogin.net.

From there, I went to Advance > Administration > Router update.

I located and selected the upgrade file on my hard disk and loaded the CAX30-V1.4.11.2.bin to downgrade my firmware version.

I then waited for the installation to complete and rebooted the router. Since performing these steps, everything seems to be working correctly. I had been dealing with these issues for almost a month, so I am relieved that the problem has been resolved.

Yayyy. Finally it worked.

I faced all possible issues with CAX30. From internet not working to only 5 Ghz not working. 

All resolved now. 

Here are the steps. 

1. Download the firmware v1.4.11.2 from netgear product support page. Extract the zip and keep the bin file handy. 

2. Login to routerlogin.net and navigate to Advance, Administration, Router update. Upload the bin file. Router will restore the stable version amd take out the bad one. 

3. Factory reset the modem. Press and hold a pin for 7 seconds on reset hole. Setup using Nighthawk app. Test the speed. 

Few tips. Dont use smart auto which merges 2.4 and 5 Ghz. You can keep the AX feature enabled. 

Download OLD firmware https://www.netgear.com/support/product/cax30#download 

Firmware Version 1.4.11.2

Upload it to CAX30 modem 

Login to Modem

Click Advanced>Administration>Router Update 

and upload the .bin file after Extracting it.

Make sure to Disable traffic meter.

I tried it and it may be coincidence, but my 5ghz Wi-Fi never worked again after the original firmware update. I had to purchase new equipment to get it back. Net gear really disappoints me when it comes to technical support. 

So Xfinity & Netgear are the causes of this well docuemtend problem.   Once you roll back the firmware, Xfinity will only go to 200 Mbps - even if you have the 800 Mbps service.  Xfinity will NOT refund / credit you for the slower speed.  My CAX30 was on the approved list before Xfinity's update - now NOT on the list.  Neither Company has a fix, so I'm out $300 for a great modem that Xfinty + Netgear screwed up.  Basically a breach of contract but nobody will fess up.

[Edited: "Solicitation"]

Wish Netgear would just fix their firmware!  Anybody hear of a possible fix?