The Oracle Solaris 11.2 SRU5 operating system (OS) image is preinstalled on the server (if ordered) in the Legacy BIOS Boot Mode. Therefore, you must boot the server in Legacy BIOS Boot Mode (the default) to make use of the preinstalled image. If you boot the server in the UEFI Boot Mode, the server will not boot the Oracle Solaris preinstalled image and it cannot be used. If you want to switch to UEFI Boot Mode and use Oracle Solaris 11.2 SRU5, you must perform a fresh installation of the Oracle Solaris OS.