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Reply to DTK: unable to restore macOS
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.
Oct ’20