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5 Firmware Update
5.1 Upgrade Procedure
The system software used by the 2757 can be updated when a newer version is available.
Please go to www.cortelco.com to check for a new version of firmware. The following
information will be needed to upgrade:
• TFTP/FTP server address
• Image file name
• username (for FTP only)
• password (for FTP only)
1. Click ‘Management’. Then click ‘Firmware Update’ tab.