Synology DSM Update Version 7.3.1-86003

DSM 7.3.1-86003 (2025-10-28) adds quality fixes and requires a restart. After installing, you cannot downgrade to a previous DSM version, and Replication Service may be updated automatically or require a compatible manual update.

• Fixed an issue where LED brightness adjustment might stop working on certain models.
• Fixed an issue where connected external devices might not appear when selecting files or folders.
• Fixed an issue where external storage devices might trigger false alerts.
• Fixed an issue where a USB-connected UPS might fail to function after a system update.

• This update restarts the Synology NAS.
• After installing this update, downgrading to a previous DSM version is not possible.
• If auto update does not run, perform a manual update in Control Panel.
• Before updating, follow the instructions and complete the required actions to ensure success.
• This version is released in a staged rollout.
• Some listed models will not receive this update through notifications and can only download the upgrade patch from Synology Download Center.
• Replication Service will be automatically updated or may require a manual update to a compatible version.

Product Information

Vendor: Synology

Product: DSM

Version: 7.3.1-86003

Release date: Oct 28, 2025