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The 7300 meter has two separate revisions based on when it was originally manufactured. Any meter made before 2000 is a hardware revision A and any meter manufactured afterwards is a revision B. Serial numbers ending with a -10 and a starting code of V250 are indicators of revision B. If you are unsure of your firmware revision contact tech support with the serial number of your meter. It is important to ensure that the correct upg files are used for upgrading the meters as Revision A and B are not compatible with one another.