ZyXEL Communications P-2602HW(L) Series - Manual (Page 180)

P-2602H(W)(L)-DxA Series User’s Guide
180 Chapter 12 Phone Usage
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.