To update SP firmware from the HOST, Oracle is standardizing on the fwupdate utility. This utility is included in Oracle Solaris as part of the Oracle Hardware Management Pack (OHMP).
For more information on using the fwpudate utility that is included in Oracle Solaris 11.3, refer to Using fwupdate to Update Firmware (http://docs.oracle.com/cd/E64576_01/html/E64582/gyuui.html#scrolltoc) in the Oracle Server CLI Tools for Oracle Solaris 11.3 User Guide.
When you follow the steps in that procedure, and have obtained a desired firmware package, use this command to update the SP from the HOST:
fwupdate update all -x powercyle_metadata.xml
firmware-package-file.pkg is the path to the firmware package for your server's SP.