Galaxy s GT-S7562

I've a problem with the GT-S7562. The device does an automatic reboot. The problem is that if I delete applications they will show up again after the reboot ( same apps, same files and same settings) every time I delete apps or files or change settings everything goes in vain once the device reboots. I've tried to do a hard reset and a recovery still doesn't change anything; same apps, same files and same settings. I've tried to flash a ROM; same result once the phone boots I'm still on the old ROM with the same apps, same files and same settings. What do you recommend?
Please I really need your help!