I have an early 2015 macbook air and I had the exact same issue. This issue persists even after erasing the disc using “HFS+ ” as suggested in the comments.Īpple Support has finally asked me to go ahead and create a bootable installer to try and boot from an external device. I was on call with Apple Support for almost 1.5 hrs today and they were not able to solve the issue. It is not working and fails at the same last step. I've also tried Disk Utility - ran First Aid on the disk and then re-installing Sierra. ![]() I have now tried it thrice but I keep getting the same error. It failed at last step of the installation stating “ Error Occurred while Preparing the Installation” error. I restarted the MBA in recovery mode and tried to re-install macOS, after which it did some pre-checks and prompted me to install Sierra ![]() ![]() Now, when the system restarted it showed a folder with a flashing question mark (?) since it was not able to find anything to boot. So I erased the Air using the steps provided in the official Apple Support website. I have an early 2015 MacBook Air - which had macOS Monterey installed that I want to exchange with my new Macbook Pro.
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