DTK: unable to restore macOS

Question

Created Sep ’20

Replies 7

Boosts 0

Views 12k

Participants 7

running macOS Big Sur Beta 6 on iMac 2017 and/or Mac mini 2014. installed Xcode 12 beta 6 and Apple Configurator 2.13 beta 4. when trying to restore the operating system (UniversalMac11.020A5364e_Restore.ipsw) onto the DTK I'm getting an error:

The OS cannot be restored on this device.
Failed to restore device in recovery mode, libusbrestore error:21 [com.apple.MobileDevice.MobileRestore – 0x15 (21)]

tried to restore countless times, it fails always with this error.
DTK is bricked (orange (SOS) blinking LED.

Boost

Answer 1

DTS Engineer OP

Apple

Sep ’20

Please direct questions about the DTK into the forum for the Universal App Quick Start Program. You'll find access to that forums in the menu attached to your avatar in the top right.

1

Answer 2

StefanDTK OP

Sep ’20

Same issue here, any news? My device is bricked now, I tried the steps to restore as described by Apple, but now I get the same message:

"The OS cannot be restored on this device.
The operation couldn’t be completed. (AMRestoreErrorDomain error 10 - Failed to handle message type StatusMsg) [AMRestoreErrorDomain – 0xA (10)]"

1

Answer 3

JoeFu OP

Sep ’20

Has anyone solved this problem?
Failed to unzip the restore bundle [com.apple.MobileDevice.MobileRestore – 0xFB5 (4021)]

0

Answer 4

kelvin_lim OP

Oct ’20

I am facing the same issues. Has followed the guide but no success...
https://download.developer.apple.com/Documentation/Universal_App_Quick_Start_Program_Resources/Restoring_Developer_Transition_Kit.pdf

0

Answer 5

kelvin_lim OP

Oct ’20

Hi guys,

I managed to recover my DTK through steps below:

Host Mac's OS version needs to be same or new than what's on the DTK. (For my case, Beta 9)
Download XCode Beta 2.2, Apple Configurator 2.13 (Not sure whether it's required. I didn't use it)
Download Big Sur Beta 9 ipsw from //developer.apple.com/download/universal website instead of //developer.apple.com/download website. Prior download ipsw file instead of dmg.
Follow the steps as mentioned in RestoringDeveloperTransition_Kit.pdf provided by Apple.
Connect DTK to Host Mac, Finder will prompt restore "iphone"...
Press and hold the option key to browse and select the downloaded ipsw to restore
Done!

Help it helps.

0

Answer 6

iMosaic OP

Oct ’20

Finally got my DTK running again after it bricked from an auto update. I followed the Apple guide but kept failing because I didn't realize my Host Mac wasn't updated to latest OS. Ran through steps and it booted back to normal for new setup.

0

Answer 7

@ilya OP

Oct ’20

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:

Code Block Failed to restore device in recovery mode, libusbrestore error:21 [com.apple.MobileDevice.MobileRestore – 0x15 (21)]

Has anyone been able to solve this?

0