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You need to follow disaster recovery document KB#: KB66616.
Unfortunately not - threre's no rollback for ePO patches.
Make sure you have a full backup before you upgrade - by which I mean stop the ePO services, and then take a backup of the ePO database and a backup copy of the entire ePO folder structure - and then if anything does go wrong you can restore back to where you were.
Worst-case scenario would be to have to go through the disaster recovery process as described by Hem.