RBR750 Firmware 4.6.14.3 - 2.4G Not Enabled for the Router

It might be useful to double check some things:

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dudecs wrote:

I had disabled 5G via the router configuration, but 5G remained active for the router.

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I am not aware of an option on the RBR750 to disable 5G.  Could you post a screen shot of that?

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dudecs wrote:

with no support for 2.4G WiFi in the vicinity of the router. Hope that this will be corrected on a subsequent firmware update?

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This is not likely to change because of a future firmware update.  I would look for evidence that the router is not producing a 2.4G WiFi signal by using one of the WiFi Analytics apps that displays the MAC address of each WiFi access point and the signal level of each:

• For Windows, my preference is WiFi Info View by Nirsoft. https://www.nirsoft.net/utils/wifi_information_view.html 
• For Android there are dozens of similar apps, I like
  • WiFi Analyzer by Kevin Yuan
  • VREM WiFiAnalyzer (Open Source)

With one router and two satellites, each WiFi SSID should be present three times for each channel, that is:

• The primary SSID should appear three times.on the same 2.4G WiFi channel.
• The primary SSID should appear three times on the same 5G WiFi channel.
• If the Guest network is enabled, the guest SSID should appear three times on the same 2.4G channel.
• If the Guest network is enabled, the guest SSID should appear three times on that same 5G channel.

WiFi devices not connecting where we humans know damned well they should connect, is one of the most common issues raised on the community forum.