Apple has released the EFI Firmware Updates listed below, all of which improve the reliability of booting from the network, addresses an issue that can prevent HDCP authentication after a reboot, and resolves an issue with boot device selection when a USB storage device is hot-plugged.

The updates are available via Software Update and also as standalone installers.

More info and download links:

• MacBook Air EFI Firmware Update 2.4: This update fixes several issues to improve the stability of MacBook Air (Mid 2011) computers and is recommended for all users. (4.06 MB)

• MacBook Pro EFI Firmware Update 2.7: This update fixes several issues to improve the stability of MacBook Pro (Early 2011) and MacBook Pro (Late 2011) computers and is recommended for all users. (4.24 MB)

• iMac EFI Firmware Update 1.9: This update fixes several issues to improve the stability of iMac (Early 2011) computers and is recommended for all users. (3.77 MB)

• Mac mini EFI Firmware Update 1.6: This update fixes several issues to improve the stability of Mac mini (Mid 2011) computers and is recommended for all users. (4.08 MB)

[Thanks to MacDailyNews readers too numerous to mention individually for the heads up.]