File Restoration from the client GUI:
1. Open the Symantec Endpoint Protection interface.
2. From the left-hand side menu Select View quarantine
3. Highlight the item in Quarantine, and choose Restore.
4. Confirm Restore when prompted to do so 'Are you sure you want to restore the selected files'?, choose Yes
Restoring a false positive file detection from the Symantec Endpoint Protection quarantine
https://support.symantec.com/en_US/article.TECH150607.html
le Restoration using SEPQuarantineTool.exe (SEP 12.1 only):
Symantec has an unsupported tool called SEPQuarantineTool. This tool is attached to this knowledgebase article. Download the attached ZIP file and extract it before use.
Note: The password to the ZIP file is: symantec
To view instructions for using the utility, open the Command Prompt, navigate to the directory of SEPQuarantineTool.exe using the command cd (e.g., cd Desktop), and run the tool with the /? switch. Example: SEPQuarantineTool.exe /?