I've tried several solutions to enter DFU mode but none worked: - the Home + Sleep combo - the DFU program here
Somebody has an idea?
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DFU has always worked as follows:
I've tested this on 2G, 3G, 3Gs and works on all of them fine.
Here's a video on how to do DFU properly: iPhone DFU Mode
Also I just like to note that this procedure must not be mistaken for recovery mode (iTunes cable screen), which is done by:
This is not DFU, this is recovery mode. DFU is: - 2 sec Power - 10 sec Power + Home - 15 sec Home
And it doesn't work for me.
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