There were complaints that the first firmware update fix for flickering iMac screens made no difference, but now there are whispers that a “combination software and driver patch” will come in “roughly three weeks.”
https://gizmodo.com/firmware-update-for-27-inch-imacs-to-fix-flickering-scr-5431482
The timeline for this fix is based on what customers are reporting they’ve heard from Apple Care specialists, but let’s just hope that it’s not only true, but that the fix makes a difference. [Apple Insider]
