recently, Cisco re-release 3PCC IP Phone for 3rd-party IP-PBX.
to upgrade 3PCC phone firmware, you can refer this procedure.
1. Download the zip files.
2. Unzip the files.
3. Put the files on the tftp/http/https download directory.
4. The third-party call control can also upgrade via a URL in the web browser
http://<phone_ip>/admin/upgrade?<schema>://<serv_ip[:port]>/filepath
ex) http://192.168.16.117/admin/upgrade?tftp://192.168.16.62:69/sip88xx.10-4-1OD-164-3PCC.loads
Good luck!
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