1 - yes, just reset one phone after the steps below.
2 - no
3 - manually, yes, that is you reset the phone(s) from config mode in CME.
Copy all the files into CME router. Configure all the files with "tftp-server ...". Configure load under "telephony-service" for the file SCCPxxxx.loads without the .loads extension. Reset one or more phones.
Observe and debug the proces with "term mon" and "debug tftp events".
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.