If your router supports both the 2.4 GHz and 5 GHz bands, but only one Wi-Fi name is displayed on the Wi-Fi search page of your mobile phone, perform these steps: Go to the Wireless page of the router. (The entry address is usually provided on the label attached to the back of the router).
Go to the 2.4 GHz setting page, and set the Wi-Fi name (SSID) to (XXX)-2.4G, where xxx indicates the Wi-Fi name. Save setting.
Go to the 5 GHz setting page, and set the Wi-Fi name (SSID) to (XXX)-5G, where xxx indicates the Wi-Fi name. Save setting.
When the preceding settings are complete, the new Wi-Fi names will appear on the Wi-Fi settings page of your mobile phone.
Note: After the Wi-Fi names are changed, you need to reconnect the devices that use this wireless router. The password remains the same if it has not been changed. After you have done these, please reset your camera and reconnect it again, then you can choose the 2.4Ghz wifi.
The specific steps to do so may differ accrording to the brand of your router, we suggest you contact your Wi-Fi router provider for more professional and fast assistance.