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Appendix 3. Firmware Recovery

In some rare situation, ZyWALL might not boot up successfully after firmware upgrade. The

following procedures are the steps to recover firmware to normal condition. Please connect

console cable to ZyWALL.

1. Restore the Recovery Image

 If one of the following cases occur, you need to restore the “recovery image”

 Booting failed, device show error code while uncompressing “Recovery Image”.

 Device reboot infinitely.

 Nothing displays after “Press any key to enter debug mode within 3 seconds.” for

more than1 minute.

 Startup message displays “Invalid Recovery Image”.

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ZyXEL Communications ZYWALL 5 - V4.04 Bedienungsanleitung Seite 73