Why WinKFP and not SSS to upgrade?
SSS takes a long time to run this process but it is user friendly.
WinKFP would do in a few minutes what SSS does in an 30-40-50 minutes... That why they recommend a charger when you use these tools.

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4.8is 2004 imola red
4.8is 2005 Black on Black - DINAN/2 sold
4.4 2004 X5
2003 330xi
2008 328xi - sold
4.4 2000 X5 - sold