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I got this SVP problem after buying a second hand TP W510 and releasing the CMOS-battery. Since then it asks for the SVP. I tried your trick and successfully removed the SVP, set a new one and booted without problems - for 2 or 3 times (everytime he asked for the SVP, although I disabled it after setting it new, but just pressing "enter" was sufficient). After waiting for a few minutes and trying it again, it didn't accept neither "enter" nor the new SVP I had set before. So to cut it short, it does not last with my model. Any new ideas? Besides it shows permanently the data and time error and several other ones.