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I had tried dual booting Linux and macOS, and when I rebooted my computer the OS volume shows as type 'FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF'.

I tried following OS volume shows as type 'FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF' but I think I'm doing it wrong/making it worse. I did not have a recovery partition, I did have an empty bootcamp partition ~130gb, and I believe it was macOS Catalina on APFS.

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I had played with the partitions a lot, this is what it looks like now.. Probably not correct.

I had played with the partitions a lot, this is what it looks like now.. Probably not correct.

How can I get back at least the data from my Mac partition?

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The first partition (the EFI partition) is mislocated. It should start at block 40 and end at block 409639 (=moved by 6 blocks towards the end of the disk).

In Recovery Mode you can simply remove the first partition and add it again properly aligned:

gpt remove -i 1 /dev/disk0
gpt add -i 1 -b 40 -s 409600 -t C12A7328-F81F-11D2-BA4B-00A0C93EC93B disk0

This apparently(?) solved the problem and the Mac booted again properly.

To verify the integrity of the APFS container afterwards enter:

diskutil list #to get the device number of the APFS container scheme device (probably disk1)
diskutil verifyVolume disk1

The result should be: Storage system check exit code is 0!

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