After the 10 seconds, release the "Power" button but remain pressing the "Home" button.
Your PC/MAC should recognize your iphone and probably install the DFU drivers. Unfortunately for me none of them worked, but maybe you'll be successful.
After that: Press the "Power" and "Home" Button at the same time for exactly 10 seconds.
The iphone switches into DFU mode and kills all the running processes. If the apple logo shows up a second time, youve pressed the buttons too long.
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