Synology DSM 7.3.1-86003 Update 1 Released

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Synology DSM 7.3.1-86003 Update 1 Released

On November 18, 2025, Synology released a new DSM version called DSM 7.3.1-86003 Update 1. Below I will guide you step by step through the process of installing the new DSM 7.3.1-86003 Update 1. This update fixes an important security issue that has not yet been revealed.

📝FULL DSM 7.3.1-86003 Update 1 FULL CHANGELOG

  • STEP 1

Manually Download DSM 7.3.1-86003 Update 1 by following the blue link below. From the official Synology Archive, download 7.3.1-86003 Update 1 for your NAS model.

🚀DOWNLOAD DSM 7.3.1-86003 Update 1

  • STEP 2

Go to Control Panel / Update & Restore then click on Manual DSM Update. Select the file you have previously downloaded at STEP 1 then click OK. Follow the instructions in the image below.

Synology DSM 7.3.1 86003 Update 1 Released 1

  • STEP 3

A new pop up window will open. Click OK. Follow the instructions in the image below.

Synology DSM 7.3.1 86003 Update 1 Released 2

  • STEP 4

After approximately 5 minutes your new DSM 7.3.1-86003 Update 1 will be installed on your Synology NAS device.

Synology DSM 7.3.1 86003 Update 1 Released 3

This post was updated on Tuesday / November 18th, 2025 at 5:18 PM

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