I have it figured out. The key was the following:
EVEN IF THE DTK PLAYS DEAD (NO FAN, NO POWER LED, NO BOOT CHIME, NO OUTPUT ON DISPLAY) IT SHOULD BE IN DFU MODE NOW. from @mikeboss post on https://developer.apple.com/forums/thread/661096?answerId=634483022#634483022.
I thought I had trouble putting the DTK in DFU mode, since it had so sign of life. I was resetting the power cable until DTK would chime and LED would show. That was a mistake. After rereading some of the posts, I realized that DTK was in DFU mode with no chime/LED/fan. I followed the directions in the guide and was able to restore DTK.
@ilya
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
I'm still unable to restore the DTK. I have the host running 20A5395g, with Xcode 12.2 beta 3, and Configurator 2.13.1. I'm following the instructions from the https://download.developer.apple.com/Documentation/Universal_App_Quick_Start_Program_Resources/Restoring_Developer_Transition_Kit.pdf.
The restore process always ends with the same error after a few minutes:
Failed to restore device in recovery mode, libusbrestore error:21 [com.apple.MobileDevice.MobileRestore – 0x15 (21)]
Has anyone been able to solve this?
Has anyone got this figured out? If so, what is the solution?
I ran into a similar problem. When using KextManagerLoadKextWithURL API, no error is returned on MacOS 11. On prior versions of MacOS, kOSKextReturnSystemPolicy would be returned. I believe KextManagerLoadKextWithURL API is used by both kextload and kextutil.
Is there a new, programmatic way to determine if loading of a kext succeeded?
Any help would be greatly appreciated.