How to upgrade the sccm verison from 2403 to 2509

To upgrade Configuration Manager from 2403 to 2509, use the in-console update for version 2509. Version 2509 can be applied only on sites that run version 2403 or later.

Recommended upgrade path:

1. Verify the hierarchy version
   • Every site server in the hierarchy must run the same Configuration Manager version before starting the update.
   • To update to 2509, the hierarchy must already be on 2403 or later.
2. Confirm the update can be downloaded
   • A service connection point is required at the top-level site of the hierarchy.
   • The service connection point can be online or offline.
   • If it is offline, use the service connection tool to download the update.
3. Find the update in the console
   • In the Configuration Manager console, go to Administration > Updates and Servicing.
   • When version 2509 shows as Available, it is ready to install.
   • If it stays at Downloading, review hman.log and dmpdownloader.log.
   • If dmpdownloader.log shows it is waiting for the next interval, restart the SMS_Executive service on the site server to restart the download of redistribution files.
   • Also verify that proxy settings are not blocking downloads from the required internet endpoints.
4. Start the installation from the top-level site
   • Install 2509 from the CAS or the stand-alone primary site.
   • After the top-level site is updated:
     • Child primary sites install the update automatically after the CAS finishes.
     • Secondary sites must be updated manually from the Configuration Manager console after the parent primary site finishes.

Prerequisites before upgrading:

1. Supported source version
   • The environment must be on 2403 or later.
2. Licensing status
   • An active Software Assurance (SA) agreement or equivalent subscription rights is required to install the update.
3. .NET requirement
   • Configuration Manager requires Microsoft .NET Framework 4.8 for site servers, specific site systems, and the console.
   • Update .NET first, then restart the system before running setup.
   • A pending reboot can cause component status errors and random .NET application failures until restart.
4. Windows ADK
   • The installed Windows ADK version should be supported for Configuration Manager 2509.
   • If the ADK must be updated, do that before upgrading Configuration Manager so the default boot images are updated automatically.
   • Any custom boot images must be updated manually after the site update.
5. Site system prerequisites
   • Before installing the update, make sure each site system server meets the current prerequisites for the new version.

Important behavior during the upgrade:

• Until all child primary sites finish updating:
  • Client upgrades do not start.
  • New features enabled by the update are not available.
  • Replication links can show Completed with warning or Link is being configured.

Post-upgrade tasks:

1. Update the Configuration Manager console
   • The first time the console is opened after the site update, it prompts for a console update.
   • Update all remote consoles to the same version as soon as possible.
2. Update clients
   • New functionality is not fully available until the client version is also updated to the latest version.
3. Verify site and role versions
   • In Administration, add the Version column in Sites and Distribution Points to confirm they are on 2509.
4. Check replication health
   • In Monitoring > Site Hierarchy and Monitoring > Database Replication, confirm replication is active.
5. Review environment reconfiguration items if applicable
   • Reconfigure database replicas for management points if they were removed before the update.
   • Reset availability groups to automatic failover if used.
   • Re-enable any maintenance tasks that were disabled before the update.

If the environment already runs 2403, the upgrade to 2509 is supported directly through Updates and Servicing.

References:

• What's new in version 2509 of Configuration Manager current branch
• Checklist for installing update 2509 for Configuration Manager