The iRMC will validate the signature. Within 10 seconds, the "Advanced" features will unlock. No reboot is required.
For many years, this created a hurdle for the "homelab" community—people who buy used servers on sites like eBay to learn networking or host personal projects. A common "story" for these users is buying a powerful server for a low price, only to find that essential features like —which lets you control the server's mouse and keyboard remotely—are locked behind a license key that costs more than the server itself. The Technical Mystery and Discovery
Installing the key is a simple process through the iRMC S4 Web Interface : Start Console Redirection of an out-of-band-management