Nighthawk rax40

You should perform a factory reset: 

To perform a factory reset:

1. Verify that your router’s Power light is on.
2. On the back of your router, locate the Restore Factory Settings or Reset button.
3. Use a paper clip or similar object to press and hold the Restore Factory Settings or Reset button for seven seconds.
4. Release the Restore Factory Settings or Reset button.
   Your router resets.

When you log in to your router again, use the default login credentials:

• User Name: admin
• Password: password
• Source: 
• https://kb.netgear.com/9665/How-do-I-perform-a-factory-reset-on-my-NETGEAR-router

I did this a couple of days ago.