For a reflash (which is best) you need to connect the test connectors. You can switch without connecting them though with a realtime flash. I would reflash the map you use most.
realtime:a uploaded calibration for immediate use. The calibration will remain in the ecu until the ecu losses power or is reset
Reflash;Permanent reflash of the calibration onto the ecu.
I would reflash the map you use most often. Are you using off the shelf maps or custom maps? never mix the two! Meaning if you have a custom map reflashed dont do a realtime flash to a off the shelf map.
06' wrx tr