ZyXEL Communications NXC5200 - V2.20 Uživatelský manuál stáhnout pdf (Strana 18)

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Appendix 3 - Firmware Recovery

In some rare situation, device 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 device.

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.

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ZyXEL Communications NXC5200 - V2.20 Uživatelský manuál Strana 18