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I made a wrong firmware update of Cisco 7912 phone, I've loaded a SIP
firmware instead of a SCCP firmware. I'm not able to perform the
reverse process .. I've read this article:

http://www.cisco.com/en/US/tech/tk65...80094584.shtml

but it's about 7940/7960 and seems not to work for 7912 phones.

Can you help me to solve this problem ?

Thank you,
LC

the major problem i have had in changeing the firmware is not having
the current firmware. You have to upgrade your sip firmware on the
phone to the latest version before changing it to SCCP. I would
reccomend this first. then try this link.
http://www.cisco.com/en/US/customer/...08020e72f.html
Cisco 7912 Firmware


Version and description:

The install program file name is cmterm-7912G-sccp.6-1-1.exe and the
firmware version within the install program is
CP7912060101SCCP050429A.SBIN



Release notes for Cisco IP Phones
http://www.cisco.com/en/US/products/...otes_list.html

Installation Instructions:



Step 1: Copy the cmterm-7912G-sccp.6-1-1.exe file to your hard drive.
Make a note of the location where you save the downloaded file.

Step 2: Double-click the cmterm-7912G-sccp.6-1-1.exe file and the
installation starts.

Step 3: At the Welcome screen, click Next.

Step 4: At the License Agreement screen, click Yes.

Step 5: At the SQL Server Authentication screen, enter the login name
and the password (by default the login name should be "sa"). Then
click Next.

Step 6: After the installation is completed, click OK.

Step 7: Reset all the corresponding devices.



Post-Installation Details
This executable file is to be run on the publisher and it will install
one file:

CP7912060101SCCP[version].sbin
to the call manager's tftppath (c:\program files\cisco\tftppath)

After installation, open up call manager's administration web page and
go to system -> device default
You can verify the installation, by looking at "IP Phone 7912" and
enter the new load name in the corresponding box.
for example: CP7912060101SCCP050429A.sbin (in this case, the load
version is 050429A)



To downgrade to a previous firmware version:



Step 1: Go to the Cisco CallManager Administration web page.

Step 2: From the System menu select Device Default, and the Device
Default Configuration page is displayed.

Step 3: Go to the IP Phone 7912 field and change it back to the
previous firmware version.

Step 4: Click Update.

Step 5: After the page updates, you can reset the corresponding
devices.



Cisco IP Phone Model 7912 Alternate Firmware format
The Cisco IP Phone Model 7912 Firmware version 6.1(1) is also supplied
in a zip file, as an alternative in case a Cisco CallManager is not
available to run the executable installer program. The name of this
file is cmterm-7912-sccp.6-1-1.zip.

After unzipping the firmware files, manually copy the firmware to the
appropriate directory on the TFTP server.

[IP Endpoints]

We can offer this as a service, if you still have the problem or anybody else is experiencing similar problems.
IP Endpoints
www-dot-ipendpoints-dot-co-dot-uk/repair_form.php