cisco phone 7975

i can't edit the values  on network confiration .how can i unlock the configration in cisco phone 7975 ?
wmoamerAsked:
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luc_roySystem AdminCommented:
Complete the following steps:

Unplug the power cable from the phone, hold dows the # key, and then plug the power cable in again

The phone begins its power up cycle

Release the # key after the Speaker button is no longer lit

You should see the following message on the phone

"Reset key sequence detected"

Press 123456789*0# within 60 seconds after the Headset, Mute, and Speaker buttons begin to flash

If you enter this key sequence correctly, the phone displays this prompt

Keep network cfg? 1 = yes 2 = no

In order to maintain the current network configuration settings for the phone when the phone resets, press 1. In order to reset the network configuration settings when the phone resets, press 2
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luc_roySystem AdminCommented:
if that does not work you will have to replace the firmware on the phone and config files, here is a step by step

http://www.epygi.com/forum/showthread.php?t=804
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