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DSM 7 is the operating system . You don’t uninstall & erase it.
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Let’s make sure your Plex server info is where it should be
- “Plex” shared folder - “Plex/Library/Application Support/Plex Media Server” exists
- Package Center
- Uninstall the Plex app - with the Erase option (to remove the Plex DSM 7 installation)
- Reinstall the app,