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Apple – Support – Discussions – Airport Extreme blinking amber but WiFi …. So according to Bob Timmons:
Try temporarily connecting an ethernet cable from your Mac to one of the LAN <-> ports on the AirPort Extreme.
Open AirPort Utility and click Manual Setup
Click on the word “Status” and a window will open with details about why the amber light is blinking. It may likely be a notice that a firmware update is available for your AirPort Extreme.
You can disconnect the ethernet cable once you have closed AirPort Utility.
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