Engadget
Since a few days ago, users of Studio Display have claimed that their monitors cannot be updated to the latest firmware. According to MacRumors, many people have encountered the “Apple Studio Display firmware could not be updated, please try again in an hour. If you still have problems, please contact an authorized Apple service provider” when trying to update. After seeing this message, the user’s attempts to try again are basically the result of hitting a wall, even if the access situation is changed to another computer, it will not improve.
When this happens, Apple will initially advise the user to take the monitor to an Apple Store or a repair partner to check the condition. Today, they have finally prepared a solution that can save people’s efforts. Studio Display has regained the ability to update firmware after Apple deployed an older iOS 15.4 release. If you have encountered this problem before, you may wish to try the upgrade now.
Apple stopped signing iOS 15.4 on 4/7
On 4/8, users started reporting that they couldn’t update the Studio Display to iOS 15.4 Firmware.
As of one hour ago, iOS 15.4 Firmware for the Studio Display (Appledisplay2,1) is being signed again
The firmware update installing now! ???? https://t.co/Sn1TyKgLkq pic.twitter.com/pO7rSGox1a
— Mr. Macintosh (@ClassicII_MrMac) April 11, 2022