No, it is not.
Only module that will have the Open AT logo could benefit of Open AT. Firmware upgrade can’t change this.
Module are identified by “T” suffix.
Example:
SL8082: Not supporting Open AT, label doesn’t have any Open AT logo printed on it
SL8082T: Open AT supported, label include an Open AT logo printed on it.
[attachment=0]SL8080T.png[/attachment]
While ordering module, please ensure to have the “T” one.