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3. Check the frequency band settings of your '''For this router , only '149,153,157 or 161' channel can be selected if we want to use 5G WIFI, or can't find 5G wifi in Pi 4 SSID list.'''
[[File:Routers-4. Then you can find the 5G-setting.jpg|none]]wifi on your raspberry pi SSID list
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Firstly, you must have a 2.4G/5G dual band routers.
1. Make sure you have set the correct country code using raspi configuration.
sudo raspi-config
[[File:Raspi-config-wifi-1.png|700px]]
select 'Localisation Options' and press 'ENTER'
[[File:Raspi-config-wifi-2-1.png|700px]]
select 'L4' and press 'ENTER'
[[File:Raspi-config-wifi-2.png|700px]]
select the correct country then press 'ENTER'
[[File:Raspi-config-wifi-3.png|700px]]
2. Use the 'iwlist channel' command to view the currently allowed frequency bands to be connected. These values are different for different countries.
iwlist channel
[[File:Iwlist-show.pngjpg|none700px]] 3. '''Check the frequency band settings of your router 5G WIFI''' [[File:Routers-5G-setting.jpg|1000px]]
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