Hi there, please help me. My Dell Vostro 3400 does not have set the ownership date and the manufacter date in the BIOS, both value appear to be set as {none} Do you know if I can solve this issue flashing a patched BIOS?

My service tag does not seem to be a valid one, but it is the same from the sticker in the cover.

SERVICE TAG: 6NW20H3

The thing with both date is that this laptop does not charge past the 55%, I found a troubleshooting guide in Dell website to get this issue solved setting a proper ownership date and a manufacter date, but this guide is...