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Upgrade Firmware To SIP for 7911

Dear,

i was trieng to update the firmware for cisco phones 7911 to SIP. after start the phone i keep the # pressed then i enterd 123456789*0# but it seemd it failed to communicate with the TFTP server now when i connect the phone to power it is only blinking and the screen is blank can i know how to fic this issue and how can i test the communication between the phone and the TFTP server before i go and complete the upgarde process.

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