Resetting Troubleshooting; Resetting The Zywall; System-Default.conf - ZyXEL Communications USG-100@USG-200 - V2.20 ED 2 Manual

Chapter 56 Troubleshooting
I cannot get the firmware uploaded using the commands.
The Web Configurator is the recommended method for uploading firmware. You
only need to use the command line interface if you need to recover the firmware.
See the CLI Reference Guide for how to determine if you need to recover the
firmware and how to recover it.
My packet capture captured less than I wanted or failed.
The packet capture screen's File Size sets a maximum size limit for the total
combined size of all the capture files on the ZyWALL, including any existing
capture files and any new capture files you generate. If you have existing capture
files you may need to set this size larger or delete existing capture files.
The ZyWALL stops the capture and generates the capture file when either the
capture files reach the File Size or the time period specified in the Duration field
expires.
My earlier packet capture files are missing.
New capture files overwrite existing files of the same name. Change the File
Suffix field's setting to avoid this.

56.1 Resetting the ZyWALL

If you cannot access the ZyWALL by any method, try restarting it by turning the
power off and then on again. If you still cannot access the ZyWALL by any method
or you forget the administrator password(s), you can reset the ZyWALL to its
factory-default settings. Any configuration files or shell scripts that you saved on
the ZyWALL should still be available afterwards.
Use the following procedure to reset the ZyWALL to its factory-default settings.
This overwrites the settings in the startup-config.conf file with the settings in the
system-default.conf file.
Note: This procedure removes the current configuration.
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ZyWALL USG 100/200 Series User's Guide