This update fixes several issues to improve the stability of Mac mini (mid 2011) computers and is recommended for all users.
This update includes fixes delivered in Mac mini EFI Firmware Update 1.3 that enhance the stability of Lion Recovery from an Internet connection, and resolve issues with Apple Thunderbolt Display compatibility and Thunderbolt Target Disk Mode performance on Mac Mini (mid 2011) models.
The Mac mini EFI Update will update the EFI firmware on your Mac mini computer. When your Mac mini restarts, a gray screen will appear with a status bar to indicate the progress of the update. It will take several minutes for the update to complete. Do not disturb or shut off the power on your Mac mini during this update.
Boot ROM or SMC Version Information: After Mac mini update has successfully completed, your Boot ROM Version will be MM51.88Z.0077.B0E.1110141154
Here's other similar drivers that are different versions or releases for different operating systems: