Teletronics IP-PBX Server - Manual (Page 43)

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3.3.5 Firmware Upload
Enter Management  Firmware Upload  Choose the Firmware options
(Application, Kernel and File System)  Press Browse and select firmware file 
Press Apply to start firmware upload.
Note:
•
Normally, you just need to upgrade the Application but in some situation you may
need to also upgrade the Kernel or File System. For more information, please
refer to the release note of EZLoop® IP-PBX Enterprise SIP Server.
•
After pressing Apply, please wait for success message, and DO NOT power off.
•
After upload succeed, on screen will show success message. Please reboot
system to renew system
firmware.