Macbook Pro 2019 unable to boot into MacOS but is able to boot into Windows

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Macbook Pro 2019 unable to boot into MacOS but is able to boot into Windows

Starting two months ago and after two weeks I installed Windows via Boot Camp, my MacBook can no longer boot into MacOS. Trying to boot into the safe mode and recovery mode did not work. The internet recovery also didn't work. Resetting SMC and PRAM or NVRAM is also futile. Then I discovered that it could book into Windows and operates it well.

I tried access the MacOS partition by APFS readers in Windows, but it says the partition is protected by T2 Security Chip. Launching in the target disk mode is successful, but the other machine says there is problem with the disk and therefore unable to unlock the mac partition.

I also tried making an MacOS installation USB to run the recovery, but booting into that USB also results in shut-down, moreover it makes the MacBook unable to boot into Windows. After resetting the PRAM, I got the Windows back, but still cannot boot into MacOS.

The model is MacBook 16-inch 2019 with Intel core 9750H, Radeon Pro 5300M, 32GB RAM, and 1T Storage. Any help is appreciated!

MacBook Pro 16″, macOS 13.5

Posted on Nov 1, 2023 9:24 AM

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Answer 1

Nov 3, 2023 6:12 PM in response to Alvin4H

What happens when you boot into Recovery Mode or Internet Recovery Mode? Can you authenticate using one of the admin user accounts so you can reach the utilities screen in recovery mode? What about Target Disk Mode, can you authenticate to the broken mac using an admin user account on that broken Mac?

If not, then you will need to perform a firmware "Restore" which will reset the T2 security chip & firmware, as well as erase & prepare the internal SSD for macOS. Then you should be able to boot into Internet Recovery Mode to reinstall macOS (I don't think it will push a clean copy of macOS to the internal SSD of an Intel Mac like it does with an Apple Silicon Mac). This is the only option if you cannot authenticate to the T2 security chip to access Recovery Mode or Target Disk Mode.

FYI, booting from a USB stick is not possible unless you previously modified the computer's security settings using the Startup Security Utility from Recovery Mode.

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Macbook Pro 2019 unable to boot into MacOS but is able to boot into Windows

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