We recently deployed around 100 7921s, and in 3 weeks 3 of them have gone bad. They will start the boot process, display the logo, and then crash / reset right as the main menu is being drawn. When I start the recovery process by holding down the Push to Talk and Speaker buttons, then push power, it says "Checking Firmware" and then "Success!". Then it prompts me to connect a USB cable, which I do not have.
Has anybody else encountered this, and found a work-around other than RMA'ing the phone?
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.