I have CME 8.6 on 2811 , the phone is mix 7970 - 7911 - 7965 my question about phone firmware I have 9.1.1 it's recommended to keep upgrade to the latest firmware for example now the version is 9.3 ? Or have version stable and other have some problem like beta ?
No software is perfect. Every version of phone firmware has it's own combination of bugs and features. You have to take the time to read the release notes and see if the known (and publicised !) bugs are show stoppers for you.
For example, in 9.1 firmware, a show stopper for us was that DTMF would sometimes fail. (Meaning users couldn't login to voicemail/IVR apps)
Whereas in 9.3, a show stopper for us is CDP not working.
For the minute I'm staying with 9.2 - but that may not be an acceptable to you.
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.