There is a difference between DFU and Restore mode.
While most people don't know it, this difference causes the "Error (1)" in iTunes.
DFU mode doesn't boot up the "mac os" on iPhone - therefore it doesn't communicate with iTunes "as much" as in Restore mode and iTunes can't decide to interrupt when Restoring Firmware.
How to put the iPhone into DFU:
reference: http://www.hackint0sh.org/forum/showpost.php?p=206801&postcount=1
While most people don't know it, this difference causes the "Error (1)" in iTunes.
DFU mode doesn't boot up the "mac os" on iPhone - therefore it doesn't communicate with iTunes "as much" as in Restore mode and iTunes can't decide to interrupt when Restoring Firmware.
How to put the iPhone into DFU:
- Connect iPhone to Mac/PC - keep iTunes open
- Hold down power and home button until the iPhone turns off. (some people say for 10 seconds)
- When the screen goes black, wait ~1 second more and release the power button, continue holding the home button. (at this point the screen should stay black until it is recognized by iTunes. at no time should you see the yellow triangle or logo & cable screen, if it appears, you took too long to release the power button & try again)
- iTunes should then prompt that there's an iPhone connected in "restore mode" - but it's different!
reference: http://www.hackint0sh.org/forum/showpost.php?p=206801&postcount=1
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