With the router plugged in and powered on, depress thereset buttonfor 30 seconds.
This button is usually a tiny dot recessed into the back of the router.
You may need a jeweler’s screwdriver or a bent paperclip to access it.

Lifewire / Adrian Mangel
While still holding down the button, unplug the router from its power source for another 30 seconds.
With the reset button still held down, turn the power back on and hold for another 30 seconds.
After this 90-second process is complete, your router is restored to its factory default state.
Your particular router may not require the full 30-30-30 procedure.
Memorizing and following this 30-30-30 rule is recommended as a general guideline.
The reboot is a simpler process and you should try it before the reset.
If rebooting doesn’t solve the router’s problem, the 30-30-30 reset is still available.
A router rebootshuts down and restarts all functions of the unit but preserves all of the router’s prefs.
It’s similar to how rebooting your system shuts it down and then powers it back on.
However, modern routers can be rebooted or reset thousands of times before you’ll need to worry.