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Yeah, stock ECUs tend to download and upload entire image file at a time.
Only aftermarket ECUs let you modify setting in the ECU itself. Changes take effect right away. Then you have option to save it or not depending upon whether you like that change. Very convenient and fast. Some of them even have live dashboard. It'll show you 3D view of fuel and ignition maps drawn like I show above. Then a red indicator dot will move around showing you exact area of map currently being used. Then you know exact area of map to adjust.
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