Dynamics 365 Server: How to Downgrade from Version 9.1 to 9.0
Question details
The administrator needs to revert an accidental upgrade of Dynamics 365 Server and its Reporting Extensions from version 9.1 back to 9.0.
- Product
- Microsoft Dynamics 365 Server
- Device & OS
- not provided
- Scenario
- Reverting an accidental server deployment upgrade to restore the previous operational environment.
- Observed behavior
- The system is currently running version 9.1, but the components need to be rolled back to the earlier 9.0 release safely.
Verify your compatibility requirements and ensure you have a complete, verified backup of your Dynamics 365 organization database, configuration database, and deployment before attempting any rollback.
Restore Dynamics 365 Server from Pre-Upgrade Backups
Since a direct downgrade or uninstalling an update is not officially supported, the safest method is to restore your environment using a database backup taken prior to the upgrade.
Downgrading an on-premises Dynamics 365 Server installation is not a routine supported rollback. Attempting to manually uninstall components without a proper recovery plan can lead to data corruption or total deployment failure.
Open the Windows Control Panel, navigate to Programs and Features, and completely uninstall Dynamics 365 Server 9.1 and its Reporting Extensions.
Launch the installer for Dynamics 365 Server 9.0 and follow the setup wizard to perform a clean installation on your server.
Open SQL Server Management Studio (SSMS) and restore your pre-upgrade SQL backups of both the organization database (OrganizationName_MSCRM) and the configuration database (MSCRM_CONFIG).
Open the Deployment Manager in Dynamics 365 Server 9.0, select 'Organizations', and click 'Import Organization' in the Actions pane to link your restored database.
Contact Dedicated Dynamics 365 Support
If you do not have a functional pre-upgrade backup or encounter deployment errors, consult Microsoft Support for specialized recovery assistance.
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Frequently Asked Questions
Can I just uninstall the 9.1 update from Dynamics 365 Server to revert to 9.0?
No, rolling back an on-premises Dynamics 365 Server from 9.1 to 9.0 is not a natively supported operation. Simply uninstalling the update components via the Control Panel without restoring a pre-upgrade database can corrupt your deployment.
What happens to the Reporting Extensions during the downgrade?
The Reporting Extensions cannot be downgraded automatically. You must manually uninstall the 9.1 version from the Control Panel and perform a fresh installation of the 9.0 Reporting Extensions to match your target server version.
Is it possible to migrate data from 9.1 back to 9.0 without a backup?
Without a pre-upgrade database backup, reverting to 9.0 while preserving 9.1 data is highly complex and typically requires third-party data migration tools or specialized scripts provided by Microsoft Support to export and re-import the records.
