Even a routine upgrade can fail. Here is how to fix the most frequent problems:
Follow these precise steps to deploy the update using Cisco Unified OS Administration and CUCM. cmterm7975sip942sr4zip upd
The file identifier refers to a specific SIP firmware release for the Cisco Unified IP Phone model 7975G. This package is officially designated as SIP 9.4(2)SR4 . Even a routine upgrade can fail