Sagemcom Fast 8668W - how to enable 802.11b only?

  • 3 December 2023
  • 1 reply



I use smart home devices (light bulbs, switches, plugs, sensors, robovac) and some of them require 802.11b to ad to smart home app. After adding they work correct at 802.11bgn.

My question - how to turn this modem to work only at 802.11b (B) ?

Replacing all these smart devices may be quite expensive, easier to change provider…

Thank You.


Best answer by nc1037 3 December 2023, 14:38

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Userlevel 5
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You just need to add a second, 2.4 GHz network with reduced security. 

Some devices cannot connect to the gateway’s default network.  You want to leave this network alone and ADD a second network with the + sign at the bottom of the Network tab in the T-Mobile Internet app.  For this new network, set the band to 2.4 GHz and set the WPA version to WPA/WPA2.  Try connecting your device to this second network.  Use the default network for your other devices, as much as possible.

Here are the T-Mobile support instructions for how to add the second network with the app.

Android  How to create additional Wi-Fi networks | T-Mobile Internet app | Android | T-Mobile Support

iOS  How to create additional Wi-Fi networks | T-Mobile Internet app | iOS | T-Mobile Support