@virusnoi 
 yes there is a tethered jailbreak for that!!! 
as i said download redsnow 0.9.9b4!!!! find ur ipsw!!! wehn u start redsnow there should be two options Jailbreak and Extras!!! click on extras locate ur ipsw file !! and then process should be easy !!!! u just have to click install cydia and put ur phone in dfu mode!!!! and the rest of the work should be done on you phone!! i dont think u really need a  vidoe to do this!! :p