Zycoo CooVox-U80 User Manual page 127

Please click "Browse" on the TFTP application window to locate the new firmware. In the "Server
Interface" dropdown list is a list of your PC network interfaces. Please select a correct interface(in
the same network) which can access the IPPBX system.
On the IPPBX web GUI please check the "TFTP Upgrade" radio button, and specify the exact
firmware file name in the "Enter The Package Name" blank, and in the "TFTP Server IP address"
blank please specify the IP address displayed on the TFTP application window.
Please double check the file name and TFTP server IP address then click "Apply" you will be able
to upgrade the firmware just like web upgrade.