Yes , at the end of the operation and all data have been flashed the comand prompt automatically closed and my phone reboot at the same time . But that " download screen keep appeared again ... it seem the flashing don't resolve my problem at all ( maybe because the bootloader is lock or USB debugging not enabled ? )
My fastboot driver are to date because I can send the command " fastboot reboot" to reboot my phone . Also when i send the command " fastboot devices " my phone appear bellow the line with numbers so I think it's ok .
I've noticed the flashing process and the command prompt seems to stop and rebooting my phone when " user data flashing ( something like that ) " appear in the command prompt during the flashing , dunno where it come from ...
P.S : like I said before , sorry for my English ^^ ...