Apple recently released a new firmware EFI, which are meant for some apple computers, released in 2010. Each of them will activate the ability to restore OS X Lion via the Internet at the iMac (Mid 2010), MacBook Air (Late 2010) and MacBook Pro (Early 2010). In addition, the EFI for “air” Apple laptop was fixed rather unpleasant problem which led to an unexpected reboot, if the user pressed the power button immediately after the MacBook Air from sleep.
You can download the update using the system utility “Update» (Software Update), or from Apple Support on the links listed below:
iMac EFI Update 1.8 MacBook Air EFI Firmware Update 2.3 MacBook Pro EFI Firmware Update 2.6
Initially, Lion restore function through the Internet was available only in the last Mac, but after some time, Apple began to expand its support for “older” models of their computers.