Plug your computer into the switch, and allow it to obtain an IP address.Using a spare network switch, configure it for DHCP.You will want the “Firmware files only” option. In my case I needed some older firware for the 7970, so I grabbed file cmterm-7970_.
#Cisco 2950 switch reset to factory defaults download
Download some firmware for the phone from. Download a tftp server program to your computer. The fix for this particular phone was to grab the oldest firmware available on and provide that do the phone. This 7970 had no display, and the only thing that it did was flash the line lights in sequence. I was forced to do this recently when a 7970 I had refused to boot. This involves setting up a tftp server on your PC, and taking a look at what files the phone is actually asking for. If the above methods did not work then you’ll likely have to try something more drastic. After about 60sec, this will change to green, and the phone should the boot up correctly. The line buttons should continue to scroll, but now they should be red. When the line buttons scroll down orange, you can take your finger off the hash button. Power on the phone while still holding down the # key. Power off the phone (if using inline power, just remove the ethernet). If you’ve done it right you’ll see the phrase “Upgrading”. Press 123456789*0# after the line lights buttons will begin to flash in sequence (you only have 60 seconds to do this, then it goes back to normal booting). Immediately press and hold the # key and while the Headset, Mute, and Speaker buttons begin to flash in sequence, release the # key (you may have to hold the # for 30 seconds). If you enter this key sequence correctly, the phone will display this prompt:īy pressing 1 you will preserve the current network config (think tftp server settins, etc). Press 123456789*0# after the Headset, Mute, and Speaker buttons begin to flash (you only have 60 seconds to do this, then it goes back to normal booting). Immediately press and hold the # key and while the Headset, Mute, and Speaker buttons begin to flash in sequence, release the # key. 
Pull the network cord out of the phone and plug it back in (physically resetting the unit).This process will delete everything on the phone – certificates, call history, etc – so be warned. Does your Cisco handset not boot, or have some other unexplained issue? You can do a factory reset and see if that helps (this is usually the last step in troubleshooting before the trash can).
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