Ublox 7 Reseting

Using a U-center I make a lot of changes , now I whant to reset my GPS to factory default, somebody can help me ?

Ucenter has a function to do that, does it not work ?

No, I try in Ucenter but it doesn't work, I try to reset to its original default settings by pulling BOOT_INT high(3.3V) during a power cycle. But I think I don't understand exactly what to do because doesn't work too.