LG P760 Reset on logo LG topic

Hello everyone, My Lg often dont want to turn on, so i decided to reflash ROM by KDZ...After flashing lg was turn on, but showing white screen with inscription " Ecrypting"..I couldn't do anything. So I try restore software by LG TOOL. But updating was stopped at 50 percent. I try again restoe but always stopped at 50% ( no connection). ( WHat is interesting : Language of error is in Spanish language, But program with Polish ).
When i want to turn on phone , lg resets every second on logo LG...Any ideas?