Apple today released EFI Firmware Updates for MacBook Pro, MacBook Ai, Mac mini, and iMac:
• Macbook Pro EFI Firmware Update 2.3 (4.17 MB)
This update fixes several issues to improve the stability of MacBook Pro (early 2011) computers and is recommended for all users.
• MacBook Air EFI Firmware Update 2.2 (4 MB)
This update fixes several issues to improve the stability of MacBook Air (mid 2011) computers and is recommended for all users.
• Mac mini EFI Firmware Update 1.4 (4.01 MB)
This update fixes several issues to improve the stability of Mac mini (mid 2011) computers and is recommended for all users.
• iMac EFI Update 1.7 (3.69 MB)
This update enables Lion Recovery from an Internet connection and includes fixes that resolve issues with Apple Thunderbolt Display compatibility and Thunderbolt Target Disk Mode performance on iMac (early 2011) models.
All of the EFI Firmware Updates are available via Software Update and also via standalone installers (for more info and download links, click the links above).