Good afternoon,
At the CIPT1 course I am currently teaching in Almaty, one of the participants asked me to help with a problem, related to the Cisco 7911 phone. The phone refused to accept new software (the TFTP server had SCCP 9.2.3 firmware, CUCME v7.0 was used as the TFTP server). There was a message there on phone display, saying "Upgrading" along with the MAC address of the phone. The student brought the second 7911 phone and it also behaved exactly the same way as the first one.