What is the best method to upgrade a Security Management Server to R81.

 The best method to upgrade a Security Management Server to R81.x when it is not connected to the Internet is either Advanced upgrade or CPUSE offline upgrade. Advanced upgrade is a manual procedure that involves backing up the current configuration, installing the new version from an ISO image, and restoring the configuration. CPUSE offline upgrade is an automated procedure that involves downloading the upgrade package from the Check Point User Center, transferring it to the Security Management Server, and installing it using CPUSE. SmartUpdate offline upgrade is not a valid option, as SmartUpdate is a tool for managing licenses and software packages on multiple gateways and servers1. References: 1: Check Point Software, Getting Started, Upgrading Security Management Servers.