Hi Nithish,

Thank you for the reply. In the below section they are talking about backup. What is that mean? Even on the same day of upgrade also we can't revert back to OLD version.

Rollbacks and backups

When you plan an upgrade, remember that ServiceNow does not provide a universal rollback option. Rollbacks are available for upgrades (for example, Kingston patch-to-patch and Kingston patch-to-hotfix). The rollback window is 10 days by default. You can customize this window by modifying theglide.rollback.expiration_days property. To request a rollback, contact ServiceNow Customer Support.

Avoid restoring a production instance from backup, when possible, due to downtime and data loss. When a problem cannot be solved using other methods, restoring a production instance from backup is a final option. ServiceNow can restore an instance to any point in time, regardless of when a backup is completed. ServiceNow provides customer support 24 hours a day, 7 days a week for assistance with critical post-upgrade issues.

Thanks