After successful upgrade, the ATP UI might be showing following message in System Health section of the GUI: "Device encountered an error during software update" or "An error ocured during software update. Run 'update status' from the command-line for details."
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How to verify actual upgrade status from admin CLI:
(1) admin> update status
(2) admin> less /var/log/symantec/sgs-td/update.log
In case it is possible to verify software update was completed successfully, there is a manual workaround available to remove the message from System Health. Please contact support for details.