MAC OS missing after Bootcamp install

[Justinosss]

Hi, newbie here with a problem after installing Bootcamp and Windows 10.

Macbook Pro 2019 I7, with a 2TB disk.

this is the order of what I did

Factory reset of mac to latest ios
Ran bootcamp to create partition
Installed Windows 10
Ran Easeus partition manager in Win 10 to resize windows partition and create 2 other partitions in created space - this is probably where I went wrong - should I have used Disk Utility? I didnt touch the ios partition.

When I now try to switch to IOS in Bootcamp, I get an error message that it could not locate the macOS boot volume

Booting holding the option key down, only gives the option of windows to boot into

When I boot into recovery mode, then run disk utility, the IOS partition is not listed, ie I cant click on repair, but I can see it on the graphical bar as disk0s2 when I click on the drive

I have tried also booting into Internet Recovery, but the same, the partition that the MacOs is in, c 400gb is not showing in Disk Utility, or as on option to reinstall the OS fresh.

My guess is that the MBR (or MAc equivalent) has got messed up somehow.

How do I get the macOS boot volume back?

thanks.

J

 

[Justinosss]

Update - Now got in to Internet Recovery Mode, using the Disk Utility, clicking on the MacOS partition graphic - the pie chart version shows it is unknown format, presumably it should be APFS?

Anyhow, I have decided to reformat this to APFS, and its allowing me to reload macOS onto it, now that it can see it. I've left it running whilst I get some sleep!

Whether Bootcamp/Windows will work afterwards, will have to see.

 

[Justinosss]

Success!

I now have macOS back after reformatting to APFS, and reinstalling the OS. Bootcamp in Windows 10 also works to switch between mac and Windows. Very Relieved.

Hopefully this may help someone else in a similar position.