17.1.1 Overview of Upgrade ............................................................................................................................................................... 17-1
17.2 Making Preparations.................................................................................................................................................. 17-2
17.2.1 Required System Environment................................................................................................................................................. 17-2
17.2.2 Before Upgrade ........................................................................................................................................................................ 17-2
17.3 Downloading System Software ................................................................................................................................. 17-3
17.3.1 Downloading the System Software .......................................................................................................................................... 17-3