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I just got a Google Wifi, and almost all our devices connect to the new network fine. The exception is an old Windows 7 Dell Inspiron N5110 laptop, which sees the network but isn't able to connect. It has built-in wifi, Centrino Wireless-N 1030. I tried rebooting and running Windows update, but it still won't connect.

I think the problem might be that Google Wifi supports 802.11n but the old network was 802.11g?

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My Dell notebook has the same Centrino Wireless-N 1030 Wi-Fi adapter and I can confirm that it does support 802.11n. Besides fallback to 802.11g which will decrease WLAN speed greatly, you can just try disable 802.11n Channel Bonding (see Limitations of 802.11n Channel Bonding) by going into Device Manager > Network Adapters > Intel Centrino Wireless-N 1030 > Advanced and setting property "802.11n Channel Width for band 2.4" to "20 MHz Only".

802.11n Channel Width for band 2.4 setting.

Note that this screenshot taken with driver date 2014-01-26

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The Centrino Wireless-N 1030 wifi adapter has problems with 802.11n, but you can tell it to fall back to 802.11g by going into Device Manager > Network Adapters > Intel Centrino Wireless-N 1030 > Advanced and setting property "802.11n Mode" to "Disabled".

device manager

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