Hi @Ejazmp,

The RE505X can broadcast 5GHz, but only when connected to a 5GHz source.
When using the AX73 in a mesh setup, both bands are available.
When connected to a compatible router, Wi-Fi 6 devices can take advantage of Wi-Fi 6 features, but the connection quality is only as good as the weakest link in the network.

1. RE505X Extender and 5GHz Broadcasting
The RE505X can indeed broadcast a 5GHz signal, but it needs to be connected to a 5GHz-capable router for that band to work properly. Since your ISP modem router only supports 2.4GHz, the RE505X can only extend a 2.4GHz network from it.

If you connect the RE505X to your ISP modem via the 2.4GHz band, it may be using that connection as backhaul. However, any devices connected to the RE505X's 5GHz band will still be limited by the 2.4GHz connection to the ISP modem. Therefore, if the backhaul is limited to 2.4GHz, you will not get the extra speed on the 5GHz band.

2. AX73 will be upgraded with a mesh system in the future
When you upgrade to an AX73 (as the main router) and configure it as a mesh system with RE505X, the 2.4GHz and 5GHz bands will be broadcast simultaneously. This will allow your devices to connect to the appropriate band based on their capabilities and distance from the access point. The AX73 can handle both bands efficiently.

3. Wi-Fi 6 compatibility with Wi-Fi 4 routers
If your extender is connected to your ISP's Wi-Fi 4 modem, the overall speed and performance of the devices connected to the extender will still be limited by the Wi-Fi 4 backhaul.