Apple has posted firmware updates for the iMac, Mac mini, MacBook Pro and MacBook Air. You can obtain the updates via the Software Updates component of Mac OS X’s Systems Preferences app.
iMac EFI Update 1.7 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. It’s a 3.69MB update and requires Mac OS X 10.6.8 or later.
Mac mini EFI Firmware Update 1.4 fixes several issues to improve the stability of Mac mini (mid 2011) computers and is recommended for all users. It’s a 4.01MB download and requires Mac OS X 10.7 (“Lion”).
MacBook Pro EFI Firmware Update 2.3 and MacBook Air EFI Firmware Update 2.2 fixers several issues to improve stability. They’re 4.17MB and 4MB downloads, respectively, and require Lion.
Apple has also Apple also released Thunderbolt Software Update 1.1 for Macs running OS X 10.7.2. The 72.53MB update provides support for the Apple Thunderbolt Display and bug fixes for Thunderbolt device compatibility.