@AJ2009 

The 5G does not have the distance the 2.4G has so you may be too far from the router. Set up the extender in the same room of the router to see if both bands connect, then move it to a closer area then where it was previously. 

Hi ,

I have now disabled Smart Connect feature which has led to 2 SSID i.e 2.4ghz and 5ghz on OneMesh. Then i updated the Channel to 44 manually for 5ghz , post that Repeater is able to connect on 5ghz with main router from its current location.

But if i enable Smart Connect back again to use the feature of having 1 SSID then its not connecting on 5ghz frequence with main router and speeds are low because of it

@AJ2009 

What is the firmware build that the RE305 is running?

Hi Tony,

Please find below the firmware and hardware version on RE305

Hardware Version -RE305 v3.0

Firmware Version - 1.1.2 Build 20200212 Rel. 67183

Regards,

Antony Joseph

@AJ2009 

Please update to the latest version here, and set up the device again: https://static.tp-link.com/2020/202008/20200831/RE305(V3)_200715.zip

Here is a FAQ on how to update the firmware: https://www.tp-link.com/us/support/faq/1406/