Default [Q] Help? D:

Well a few months ago my bf attempted to hack my phone... worst case scenario happend and i get a phone is locked screen.. well i learned how to get around tht by putting it in flash boot mode.. but now i recieve the update for 4.4 so i attempted to do it.. everything was fine till it went to install my phone turned off the locked screen showed and i turn it back on ... and all it keeps doing is powering off over and over again.