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Question: Could not boot into MacOS partition

Hi There,


I have Microsoft OS along with the default macOS. I was notified of the newly released upgraded version of Sierra and was asked to install it. I click to begin installation. My macbook was restarted and as the installation begins, an error pops up which halted the installation process. I was asked to press "D" for diagnose at restart.


I pressed the "D" key as my macbook restarted. I followed the instructions to test the hardware which went well. After the hardware check, my macbook restarted, but could not continue the installation.


I restarted one more time while pressing the "Options key", but this time, I can only see the windows partition (bootcamp). I do not know how to proceed to recover my macOS as I really need it.


Can you please help?


Thank you

MacBook Pro (Retina, Mid 2012), macOS High Sierra (10.13), upgrading to Sierra better/best

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Question: Could not boot into MacOS partition