When you upgrade CUCM or install a new Device Pack it’s important to make sure that your end devices are prepared for firmware upgrade. First of all check your current firmware load and newest one provided in the new version of CUCM or Device Pack. For example:
|current firmware load||new firmware load|
Look at the readme doc for the cmterm-894x-sip.9-4-2-8 firmware, at the very beginning you can see:
“9.4(2) can be upgraded only from SCCP/SIP 9.3(4) onwards!!!”
So before you will provide new firmware files for your end devices you first need to upgrade to supported version: cmterm-8941_8945-sip.9-3-1-18 > cmterm-8941_8945-sip.9-3-4-17 > cmterm-894x-sip.9-4-2-8. If not, phones will not boot up.
This article applies to all end devices when you upgrade CUCM or install new Device Packs.
You can upgrade specific devices or all of them.
Specific devices by providing Phone Load Name at Device Information field (Device > Phone).
All devices by providing Load Information at Device Defaults (Device > Device Settings > Device Defaults). Note Maximium Serving Count for tftp server: