February 2, 2023
iMac EFI Firmware Update 1.4

iMac EFI Firmware Update 1.4

Posted May 2, 2009 at 5:05pm by iClarified · 5088 views
Apple has seeded iMac EFI Firmware Update v1.4 via Software Update.

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.

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:

IM91.008D.B08

You can launch Software Update from the Apple Menu at the top left of your screen.

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iMac EFI Firmware Update 1.4
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