Know what factory reset changes
A factory reset removes saved router details and custom options. Keep the Wi-Fi name and password handy, and distinguish this from unplugging the extender for a simple restart.
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Guide
A factory reset clears saved setup. Locate the model reset button, wait for its reset indicator, then configure the extender again.

A factory reset removes saved router details and custom options. Keep the Wi-Fi name and password handy, and distinguish this from unplugging the extender for a simple restart.
NETGEAR instructs owners to locate the Reset or Factory Reset button. Its position varies by model, so use the label or manual to identify it.
With the extender powered, use a paper clip or similar tool to press and hold reset. NETGEAR support says to continue until the Power LED blinks, then release and let the unit reboot.
After factory defaults return, reconnect the extender to the router using its model guide. For EX6120, the user manual describes a seven-second hold until its Power LED turns amber.
Check the unit has power and that you are pressing Reset rather than WPS. If the interface is accessible, consult the model manual for its software reset route.
Common questions
Use the reset control while powered and follow the exact model manual. NETGEAR describes holding until the Power LED blinks; timing and indicators can vary.
Locate its Reset or Factory Reset control and follow the model-specific NETGEAR steps. Factory reset clears saved setup, so reconnect it to your router afterwards.
For EX6120, the manual says hold Factory Reset for seven seconds until the Power LED turns amber, then release and wait for reboot. Other models may differ.
AC1200 is a wireless class, not one reset sequence. Find the brand and model number and use that manufacturer manual.