I have the same problem, so I disabled the DHCP server because according to the PDI Helpdesk, there are a lot of ip phone 8831 with this issue. They can´t receive the TFTP server information from DHCP Server.

I did the same upgrade path. After you open a case on licensing@cisco.com, they will tell you to use a tool called Cisco License Count Utility that will generate a report. So you send this report to Cisco and they will convert the existing licenses t...