Upgrade to 8.1.0

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I just updated with Softalicious and got this:
An exception occurred while executing 'INSERT INTO SystemDatabaseMigrations (version) VALUES (?)' with params ["571"]: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '571' for key 'PRIMARY'

No idea what to do.
How can I rollback to the previous version?
Thanks.