Thaaaaaaaaaaaaanks!!!!
My brother was listening to music on his phone and his battery wasnt charged and suddenly it turned off, then when he turned it back on it was just rebooting on the logo, every 10 seconds doing the same, with this tutorial IT CAME BACK TO LIFE!!!
As others, when it reboots on the logo, the software doesnt recognice the phone on the usb port, i just rebooted the pc, and when i plugged the celphone it recognized it, then i followed the steps and 5 minutes later... DONE!!
Thanks a lot again!!!