This update fixes several issues to improve the stability of MacBook Air (mid 2011) computers and is recommended for all users.
This update includes fixes delivered in MacBook Air EFI Firmware Update 2.1 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 MacBook Air (mid 2011) models.
The MacBook Air EFI Update will update the EFI firmware on your notebook computer. Your computer's power cord must be connected and plugged into a working power source. When your MacBook Air 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 MacBook Air during this update.
Boot ROM or SMC Version Information: After MacBook Air update has successfully completed, your Boot ROM Version will be MBA41.88Z.0077.B0E.1110141154
Here's other similar drivers that are different versions or releases for different operating systems: