iPhone reboots after apple logo
I have some very strange problems with my iPhone 4S (16GB), I got it from my friend and he doesn't know why the iPhone can't start anymore.
If I turn on the phone, I see the Apple Logo and after some seconds, the phones crashes and is restarting in a loop, always crashing on the Apple Logo. It looks like something is termenating the phone - is there a problem with the bootloader?
I tried several things:
- Turn phone in DFU-Mode -> iTunes Recovery -> iPhone is restarting during the Recovery and loops
- Turn phone in Recovery-Mode -> iTunes Recovery -> iPhone is restarting during the Recovery and loops again
- Turn phone on and hold the upper volume button -> reboots after some more seconds
I tried to restore the IPSW file from Apple Server for iOS 7.1.2.
Here is a video:
I also can't restore any files with programs like "Wondershare Dr. Fone" - the program needs a phone which can boot up.
So, does anyone know any more tricks or something how I can "repair" the iPhone?
OR: Does it look like a "dead battery"?