Cortelco 2757 manual Recover from Unsuccessful Firmware Update

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2.Enter the upgrade server (TFTP or FTP) address. Select the server type (TFTP or FTP). Enter the upgrade filename, username, and password on this page. Note that TFTP does not require a username or password. Then press ‘SAVE’.

After the information is saved, press ‘UPGRADE’, the IP Phone will connect to the upgrade server and start to download firmware. This will take several minutes. After the download is complete, the 2757 will reboot, and then will be ready for use with the new firmware.

WARNING: Do not disconnect power, press any key, take the phone off-hook, or disconnect from the network during the upgrade procedure. This can cause the downloaded firmware to be corrupt and the upgrade will fail!

5.2 Recover from Unsuccessful Firmware Update

If the download fails, the 2757 may malfunction. If this happens, use the following instructions to restore it to a normal state.

1.Reboot the 2757 per Section 3-10. If that does not work, disconnect the power cord and reconnect it after 10 seconds.

2.You should see ‘Loading’ on the LCD. Both the ‘headset’ and ‘mute’ key will illuminate for 2

seconds. After this press the ‘*’ key twice, and the original firmware will be recovered. If this does not solve the problem, please contact your dealer.

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Contents VoIP Phone Users Guide Table of Contents 10.1 Recover from Unsuccessful Firmware Update Package Contents FeaturesBasic Setup Page Network Setup Static IP AddressPage Described above to enter the subnet mask PPPoE Page Page Page Dhcp Page Network Setup Web Configuration Display IP AddressWeb Interface Network Configuration Page Page SIP Server Information Setup Page Page Page SIP Server Information Setup Web Configuration Page Accepting and Making Phone Calls Accepting phone callsTransfer Trfr In-Call OptionsAttended Transfer 2.2 3-way Blind TransferPage Hold LineMaking phone calls Caller ID on Call Waiting Calling History Placed Calls Missed CallsReceived Calls Unanswered CallsReceiving Calls Call Rejection DNDPlacing Calls Speakerphone and HeadsetSpeed Dial HeadsetAdvanced Settings Call ForwardingForward Timer Handset Volume/Handsfree Volume/Headset VolumeRing Volume End of Dial KeySet Time Zone Entry of Call Forward numbers from phoneNTP Server Address Phone Book Management Web InterfacePhone Interface Page Browse System Information LCD screenClick ‘Status’ Page Change Display Language Change Ringer Type Adjust the Contrast of LCD Screen Page Reboot the IP Phone Click on ‘Management’ Factory Reset Click ‘Management’ Change Password for the Web Interface Troubleshooting Firmware Update Upgrade ProcedureRecover from Unsuccessful Firmware Update
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