Looks like you want to update just a single 9951 phone's firmware while keeping other 9951's at present load ( as they are not facing any issues ). Yes, you can update just a single phone, sure. Just put the to-be-upgraded phoneload name in the field "
Save it & restart it for the phone to take that new firmware.
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You should be able to RESET the phone from CUCM and the phone should go down after there's no active calls. If for whatever reason the phone still thinks it's active, force it with a shut no shut on the switchports. This will allow you to reset the phones from a centralized point remotely. One of the many benefits of PoE.
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.