Stuck at progress bar after login after updating OpenCore

I've installed Sonoma onto 2016 MBP15" a while a go. Yesterday I've just clicked thru OpenCore update/agree/yes/next flow without really understanding what it does. I think I've mistakenly installed/patched something on main volume.

After last reboot in root it wouldn't go past 1/3rd on progress bar you see when logging in.

Any ideas how to fix it or how to connect to it's drive for a data rescue and fresh reinstall?

submitted by /u/dzh
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