RBR750 WiFi stop working after firmware update

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andrewka wrote:

WiFi stop working absolutely. It's not advertising the WiFi network.

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You'll need to explain a  bit more about what that means and what is happening at your end before anyone can begun to help.

It might also help to check the section given over yo your Orbi hardware. (This place is a confusing mess of sections.)

While many questions about routers are generic and could be answered anywhere, some things need specialist knowledge.

You might get more help, and find earlier questions and answers specific to your device, in the appropriate section for your hardware. That's probably here:

Orbi WiFi 6 (AX) and WiFi 6E (AXE) - NETGEAR Communities

You might like to search there for messages related to your issue.

I will ask the Netgear moderator to move your message.

In the meantime you could visit the support pages:

Support | NETGEAR

Feed in your model number and check the documentation for your hardware. Look at the label on the device for the model number.

Check for various troubleshooting tips.

You may have done this already. I can't tell from your message.

I mention it because Netgear stopped supplying printed manuals and CD versions some years ago and people sometimes miss the downloads.