How to update M580 application from CPUv1.xx to v2.0?

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In Unity v10's release notes:
(**) A M580 application with CPU V1.1x (developed with Unity Pro V8.0 or 8.1, or 10.0) cannot be updated to CPU V2.0 : due to compatibility issues, the “Change CPU” option is not allowed. The proposed solution is to export/import variables and program into a new application.