This will download the currently selected logging session and load it into the software for review, graphing, and playback. The main window progress bar at the bottom left corner will display the download percentage during the download.
For the KTunerECU Revision 1 hardware a full erase can take up to 2 minutes. You can continue to use the software during this process, but on board logging will not be operational until the erase has completed. It's best to allow this to fully complete before removing power to the unit or corruption of new recordings may occur. As outlined on the hardware status LEDs topic the Red LED will be on with a flicker until the erase has completed.