Try the directions below:
csrutil authenticated-root disable
sudo mount -uw /Volumes/Macintosh\ HD\ 1
sudo /System/Library/Filesystem/apfs.fs/Contents/Resources/apfssystemsnapshot -s "SnapshotName" -v /Volumes/Macintosh\ HD\ 1
sudo /System/Library/Filesystem/apfs.fs/Contents/Resources/apfssystemsnapshot -r "SnapshotName" -v /Volumes/Macintosh\ HD\ 1
Sarassine
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Try changing your Secure Boot option to "Medium Security" or "No Security" if you are on a computer with a T2 chip.