Router Firmware Update (?) Killed 2..4 Ghz WiFi

[piston]

Left SageCom Router (vintage 2022-ish) switched on overnight Jan. 8 2025.

Next am all good except mobile phone cannot connect via wi-fi.

Investigation shows 2.4Ghz wi-fi, though toggled ON, shows as : Disabled (in red). No amount of toggling wi-fi  or rebooting router has any effect. 5GHz fine and toggles on/off etc just 2.4GHz, which mobile needs.

BUT also, firmware now show as SG4K 1000106 © TalkTalk 2025 ie bang up to date! on 3-ish yr old device. Have I had a 'weapons grade'  overnight firmware update? Is there a patch?

I really do need 2.4 Gig access back... er Help! ☹️

Have avoided Factory Reset for fear of triggering booby traps and losing all connectivity.

A simple New Year greeting card would have sufficed 😉

Regards to all.

[KeithFrench]

Hi @piston 

That firmware should end in 206, not 106, please can you recheck that?

Assuming that your Sagemcom router is running V206, there is a bug in the firmware affecting this. If you disable & later re-enable either WiFi band, it won't come back properly, even if the router's UI shows it as enabled. The only workaround is to perform a factory reset on the router, please can you do that? If you still have problems, do not disable the bands again, but I will need to help you check what is going wrong.

The information below is provided by TalkTalk, for confirmation please contact @Debbie-TalkTalk or@Michelle-TalkTalk.

KeithFrench is one of our valued Community Stars and can help with a range of issues related to wireless and networking. At times he may ask you to send him test results via a Private Message to help analyse/diagnose an issue. Although Keith does not work for TalkTalk, he very kindly shares his time and knowledge to help with others.

If you need further help or, if we need to take any details such as personal information about your account like phone numbers, account numbers etc. one of the TalkTalk team will jump in and help out.