How can you determine if a non unity Quantum PLC can be upgraded to a Unity Quantum PLC?

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Issue
Need to understand which controllers can be upgraded to Unity/Control Expert.

Product line
Modicon Quantum, Unity Pro, Control Expert

Resolution
A Quantum PLC with an A as the last digit in part number + PV=>4 or B as last digit can be updated to Unity.
Example:

140CPU53414A PV:04
140CPU43412A PV:04
140CPU53414B