Hard reset ZyXEL NBG420N

Factory reset (Hard reset)

In order to hard reset your ZyXEL NBG420N:

1. Power on your device.
2. Locate the Reset pinhole on the bottom of the unit.
3. Press with a paperclip or a sharp object for at least 5 seconds.

Firmware Firmware link
Default username admin
Default password admin
Default IP address 192.168.1.1