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