Why are all the green lights on the D-Link DIR-809 router flashing simultaneously?

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When all the green lights on the D-Link DIR-809 router are flashing in sync, it generally indicates a specific situation that requires particular attention. This behavior is not normal during the standard operation of the router.

Firmware update in progress: The most common reason for all the lights flashing simultaneously is a firmware update of the router. During this process, the LEDs flash to indicate that the router is being updated. This state can last several minutes depending on the size of the firmware file. It is absolutely critical not to interrupt this process: do not turn off the router, do not unplug the power supply, and do not press any buttons until the flashing stops and the lights stabilize.

Router reset or restart: If you have just pressed the reset button or restarted the router, the simultaneous flashing of the lights indicates that the reset process is underway. Wait 1 to 2 minutes for the router to complete its restart cycle and for the lights to return to their normal state (usually stable and lit for active lights).

Power issue: An abnormal flashing of all the lights may also signal a power issue. Check that the power cable is properly connected to the router and the wall outlet, and that the electrical outlet is functioning normally. You can check by plugging another device into the same outlet.

Recommended first step: Wait 2 to 3 minutes to see if the flashing stops naturally (update or restart in progress). If the flashing persists after this time or if there are signs of abnormality (suspicious smell, warm casing), perform a complete restart: unplug the power adapter, wait 30 seconds, then plug it back in. Observe if the lights stabilize after this operation.

If the problem persists despite these checks, contact D-Link technical support at eu.dlink.com/support for further assistance, as the router may have a hardware malfunction requiring professional intervention.

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