ZyXEL Communications 3.1 User Manual

 Chapter 39 File Manager

ZyWALL (ZLD) CLI Reference Guide

The ZyWALL’s recovery image and/or firmware could be damaged, for example by the power going 
off during a firmware upgrade. This section describes how the ZyWALL notifies you of a damaged 
recovery image or firmware file. Use this section if your device has stopped responding for an 
extended period of time and you cannot access or ping it. Note that the ZyWALL does not respond 
while starting up. It takes less than five minutes to start up with the default configuration, but the 
start up time increases with the complexity of your configuration.  

Use a console cable and connect to the ZyWALL via a terminal emulation program (such as 
HyperTerminal). Your console session displays the ZyWALL’s startup messages. If you cannot see 
any messages, check the terminal emulation program’s settings (see 

) and 

restart the ZyWALL. 

The system startup messages display followed by “Press any key to enter debug mode within 3 
seconds.” 

Note: Do not press any keys at this point. Wait to see what displays next.

System Startup Stopped

If the console session displays “Invalid Firmware”, or “Invalid Recovery Image”, or the console 
freezes at "Press any key to enter debug mode within 3 seconds" for more than one minute, go to 

 to restore the recovery image.

Recovery Image Damaged