iMac EFI Firmware Update 1.4 has been released
This update fixes intermittent system freeze issues for iMac computers with ATI Radeon HD 4850 graphics and fixes wake-from-sleep issues in Boot Camp.Download
To complete the firmware update process, please follow the instructions in the updater application (/Applications/Utilities/iMac EFI Firmware Update.app). The updater will launch automatically when the Installer closes.
After the firmware is successfully applied to your Mac, your Boot ROM Version will be:amp;#8232;
IM91.008D.B08
System Requirements
Mac OS X 10.5.6 or later
License: Update
Requires: OSX 10.4+
Size: 1.7Mb