According to the information available in the support area of ​​the Apple website, this EFI firmware update is intended to solve various problems related to booting, entering and leaving sleep when using Boot Camp.
Apple has also released Firmware Restoration CD 1.2 software, by which you can restore the firmware of any Mac based on Intel processors.
Users can download the software and create a CD.
They can then use the CD to restore the software on any Mac where a previous Firmware update has failed.
Web: http://www.apple.com/support/downloads/
