Appendix 2. Firmware Recovery - ZyXEL Communications UAG5100 Firmware Release Notes

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Appendix 2. Firmware Recovery

In some rare situation, UAG 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 UAG.
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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