Lost the Option to Boot into macOS After Windows 10 Bootcamp Installation Recently I tried installing Windows 10 using Boot Camp on my MacBook Pro. The initial steps went smoothly until the actual windows installation where I was unable to install Windows on Boot Camp drive. I don't recall exactly if it was a MBR/GPT or NTFS/FAT32 issue, but after formatting the drive I was able to proceed with the installation.

Now Windows 10 is installed and working as expected, and so is the Boot Camp Utility software inside Windows.

The problem is that I have lost the option to boot into macOS. After restarting the machine and holding the Option key, "Windows" is the only option I have. Even after setting the default boot option to macOS inside the Bootcamp utility and restarting the machine I am back in Windows.

I tried the Apple recovery tool by holding the CMD+R at startup and downloading it. After going to the Disk Utility section the the Macintosh HD drive is greyed out:



Which is solved by unlocking the drive and entering my macOS password. But after restart and going to the Disk Utility it's still greyed out.

And this is the result of running "Verify Disk" on Macintosh HD.



Looking at the free space on the drive it seems that the data is there.



Since I don't have access to an Apple Store in my area to seek support I was wondering if there's a way to repair the boot and boot into macOS without losing any of my data?

And this is the output of gpt -r show disk0 and diskutil cs list entered in Terminal:



UPDATE: Recently I tried decrypting Macintosh HD after unlocking from Disk Utility and nothing happened. Then I tried the same process from the command line and this is what I get:

Error: -69750: Unable to modify a FileVault context
If you have access to Windows only I'd suggest you to try these steps:

Access the run command via Win + R (I don't know how Bootcamp actually remaps Win key, alternatively just open start menu and type run).

Insert msconfig once inside the Run GUI. 

Once accessed the System Configuration Utility click on the Boot tab.

Check the option No GUI boot and click OK.

Now you have to Restart and hold down Option key.


You should now see Mac OS and Recovery as boot options.
Enter Recovery --&gt; Startup Disk, now you may be able to select you default boot drive.
If you have Filevault enabled, one way of making the default boot drive selection option appear is to change the Boot Security from High to Medium or None back to High. It will then prompt you to enter your password so it can check to confirm that the encrypted drive is bootable. Then you can select the partition and choose to boot from it.
Now Reboot as you would normally(without pressing any key while you're doing it) and you should boot automatically inside Mac OS, from there I'd create a new Bootcamp instance.