asterisk users - Jul 2006 - Cisco 7912 IP Phone - Convert SIP to SCCP

Hi all,
   
  I converted a Cisco 7912 IP phone from SCCP to SIP version and successfully
registered with asterisk. And now I want to install back the SCCP firmware.
   
  I managed to convert both SCCP to SIP and SIP to SCCP in Cisco 7940 IP phone
but I cannot do it in 7912?
   
  Is there anyone knows how to do it?
   
  Thanks.

 		
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