We are going to be upgrading our CUCM to version 7.x at some point in the very near future. I read that we have to be running 8.4.x firmware on the phones. I have downloaded 8.4.3 and I want to test it on a couple of phones before pushing it out to all of them. Can this be done?
Sure it can, download the service pack containing firmware file you are planning on using after the upgrade, install the service pack and it will change the device defaults to the firmware file included in it, then restart tftp server and all phones should download and install the firmware.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.