A header install wouldn't trigger this. Changing a battery wouldn't do this either, unless it's dead? Does it make a click noise when you try cranking it?
And it might be that K-Pro is unable to load a map onto the ECU? Is your immobilizer matched up to the ECU? If it's not, you will need to disable the immobilizer in K-Pro, upload the map again and try cranking.
Try to upload a base map to the ECU if you can. Btw, are you using Windows 7? I had troubles getting the driver to install, but read somewhere that you just need to do a few things to make it work.
Can't you save the calibration though? And for Windows 7 you might need to do more work to get K-Pro/Kmanager working right. Just Google search it and you'll find it. Sorry, I don't have the link bookmarked.
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