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please excuse, I am new to iPhone, as I repair it for a friend.
It's an 4S from USA that some other friend of him wanted to unlock for germany.

So I don't know what he did exactly, but:
When I restart by holding home+power, it restarts like expected. The apple appears for 2 minutes, then the (respring?) turns 180 degree and then stops.
There's also no way to get it into DFU mode, it boots no matter if I hold the home button.
Also when I hold vol+, it won't boot.

I'm out of ideas to get this to boot.

  • Now I shutdown by holding pwr+home for 7 seconds. Held the home-button while connecting to the pc. Now it's in restore mode... – davidbaumann May 9 '14 at 10:43
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I could fix it with some luck now.
I didn't restart by holding power+home for 7 seconds.

I pressed them for about 5 seconds, until the screen turned off.
Then I held the home button, and connected it to a pc withouth iTunes installed. (This didn't work with a pc with iTunes!)
Now it asked me to connect to iTunes, so I connected it to another pc having iTunes installed.
After iTunes finished restoring, the phone worked perfect again.

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