This document provides steps for performing a support package upgrade using the Software Update Manager (SUM) tool. It discusses prerequisites like maintaining the kernel at the latest level and having sufficient free database space. The 14 steps described include downloading SUM, generating a stack XML file, initializing and extracting system information, importing SPAM, configuring parallel processes, upgrading a shadow system, and copying the changes to the original system if successful. The full upgrade can be done for both ABAP and Java stacks simultaneously to reduce downtime.