P-2602H(W)(L)-DxA Series User's Guide
12.5 Auto Firmware Upgrade
During auto-provisioning, the ZyXEL Device checks to see if there is a newer firmware
version. If newer firmware is available, the ZyXEL Device plays a recording when you pick
up your phone's handset.
Press "*99#" to upgrade the ZyXEL Device's firmware.
Press "#99#" to not upgrade the ZyXEL Device's firmware.
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Chapter 12 Phone Usage