Firmware VersionV6.01.07 So this is super annoying. I cannot connect to the 2.4ghz wifi anymore with my phone. 5ghz works fine. A lot of devices are still connected to 2.4 but I just cannot connect. Tried rebooting, etc. No effect. The error on the phone is COULDN'T AUTHENTICATE CONNECTION. Same with my echo shows. They all say INCORRECT PASSWORD. And of course there's no more tech support for this $400 cable modem. Computer says CAN'T CONNECT TO THIS NETWORK. Rebooted the modem over and over.

1. you say some devices are connected to the 2.4gh? how many? which ones connect? which ones dont?2. did you try changing the password? remove any special characters or spaces from the ssid/password?3. when did it start? Was anything changed when it started?

Looks like the firmware was updated by Comcast. Recently started in the last couple days. Yeah changing the password has no effect, it does the same thing.

have you tried a simple factory reset and reinstall?Push and hold reset for 7-15 seconds while its powered on

I have not. I saw a post about someone else that has me thinking. The firmware jumped from 3.xx to 6.xx and the guy is saying Comcasf pushed the wrong firmware to these, from a different device. No firmware jumps 3 majors. I Called clueless Comcast and the lady sat there and tried to tell me Comcast doesn't push the firmware out. I literally hung up on her.

Try the reset. Maybe the firmware change was enough to mess up the old settings.

C7800 - Cannot connect to 2.4Ghz anymore.

19 Replies

plemans
Guru - Experienced User
Jul 25, 2021
1. you say some devices are connected to the 2.4gh? how many? which ones connect? which ones dont?
2. did you try changing the password? remove any special characters or spaces from the ssid/password?
3. when did it start? Was anything changed when it started?
- braddman
  Star
  Jul 25, 2021
  Looks like the firmware was updated by Comcast. Recently started in the last couple days. Yeah changing the password has no effect, it does the same thing.
  - plemans
    Guru - Experienced User
    Jul 25, 2021
    have you tried a simple factory reset and reinstall?
    Push and hold reset for 7-15 seconds while its powered on

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C7800 - Cannot connect to 2.4Ghz anymore.