I've tried several solutions to enter DFU mode but none worked: - the Home + Sleep combo - the DFU program here
Somebody has an idea?
DFU has always worked as follows:
I've tested this on 2g, 3g, 3gs and works on all of them fine.
Edit: 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.
Can anyone confirm that these instructions still work with iTunes 12.4 and an iPhone 3G with iOS 4.0.2? I am unable to achieve DFU with that combo.
Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?