When upgrading to new PIX code, always step up to the next platform by one. For example, if you are currently running version 4.1.2 and you want to upgrade to 5.1.2 , you would step to 4.1(6) , verify a successful upgrade, then upgrade to 4.2(5) verify again, then upgrade to 4.3(2) and so on until you have upgraded to 5.1(2). Stepping through different codes helps transition the PIX commands and the activation key between different code classes.
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.