Hi,

I've got a 3g from a friend, which freezes with the apple logo (and some garbage pixels) when booting. It is not possible to turn it off or reboot it, even when pressing both buttons for more than five secs. So the only possibility to turn it off is to wait until the battery is empty. I've tried to bring it into recovery mode, but no luck, it also freezes.
How to get the iphone into dfu mode? The problem is, that I cannot connect it to my computer without starting it, or if it is empty showing the red battery logo. Does anyone have another solution to this problem?

Thanks in advance,
Tobin

Originally Posted by tobin

Hi,

I've got a 3g from a friend, which freezes with the apple logo (and some garbage pixels) when booting. It is not possible to turn it off or reboot it, even when pressing both buttons for more than five secs. So the only possibility to turn it off is to wait until the battery is empty. I've tried to bring it into recovery mode, but no luck, it also freezes.
How to get the iphone into dfu mode? The problem is, that I cannot connect it to my computer without starting it, or if it is empty showing the red battery logo. Does anyone have another solution to this problem?

Thanks in advance,
Tobin

The procedure for entering DFU mode requires that have the phone connected to power via the dock connector (either to a computer, or to an external official apple charger)

http://www.hackint0sh.org/f137/54082.htm

Originally Posted by Olethros

The procedure for entering DFU mode requires that have the phone connected to power via the dock connector (either to a computer, or to an external official apple charger)

http://www.hackint0sh.org/f137/54082.htm

Thanks for your reply. I have a dock connector but do not see any details on the quoted site how to use it to enter dfu mode. Can you please give me a few more hints?

Originally Posted by tobin

Thanks for your reply. I have a dock connector but do not see any details on the quoted site how to use it to enter dfu mode. Can you please give me a few more hints?

When I say dock connector, I mean the 30-pin socket on the bottonm of the phone - you don't need an iPhone dock (the white pastic stand) to enter DFU.

To enter DFU, there are multiple methods. The simplest is if you can begin with the device connected to power (via the dock connector) but powered off - by holding down sleep/power button and selecting "slide to power off" (not simply asleep)

If you cannot manage to power off the device, then you need to start by forcing a restart of the device (again while it has power via the dock connector). The timing is different with this because you start from a different initial state.

To force a restart, you hold down both power and home buttons for about 7-10 seconds. The screen should go black (for few seconds) and then the device restarts and the apple logo appears.

If you force a restart, then wait approx 5-7 seconds, then release the sleep/power button whilst still holding the home button, the screen should remain black and the device should enter DFU mode within 5-15 seconds. In DFU mode the screen will be black, but the backlight will be on (so it is a brighter black than simply powered off)

The only time I have seen people experience problems with entering DFU mode (using the correct method) are:

1. Battery too flat
2. Home or power button broken.
3. Dock connector/ESD blown/charging circuit damaged - not detecting power

Thanks for your fast reply.

Originally Posted by Olethros

When I say dock connector, I mean the 30-pin socket on the bottonm of the phone - you don't need an iPhone dock (the white pastic stand) to enter DFU.

Sorry, this was a misunderstanding on my side .

To enter DFU, there are multiple methods. The simplest is if you can begin with the device connected to power (via the dock connector) but powered off - by holding down sleep/power button and selecting "slide to power off" (not simply asleep)

I manged it once (don't ask me how) to get it without power onto the usb port, but when I try to enter dfu mode via the standard procedure, it just shows the apple logo after ~one second although I still holding the power button and dfu mode does not work.

If you cannot manage to power off the device, then you need to start by forcing a restart of the device (again while it has power via the dock connector). The timing is different with this because you start from a different initial state.

To force a restart, you hold down both power and home buttons for about 7-10 seconds. The screen should go black (for few seconds) and then the device restarts and the apple logo appears.

If you force a restart, then wait approx 5-7 seconds, then release the sleep/power button whilst still holding the home button, the screen should remain black and the device should enter DFU mode within 5-15 seconds. In DFU mode the screen will be black, but the backlight will be on (so it is a brighter black than simply powered off)

Here is another problem, when the Iphone is stucked and I cannot reboot it, even when pressing both buttons for 30 seconds! Once in a while it reboots automatically but again get stucked after ~20 seconds.

The only time I have seen people experience problems with entering DFU mode (using the correct method) are:

1. Battery too flat
2. Home or power button broken.
3. Dock connector/ESD blown/charging circuit damaged - not detecting power

None of these problems should apply to my phone . Do you (or anyone else) has another idea? On no stage of the whole process was the iphone ever recognized by itunes.

Originally Posted by tobin

it just shows the apple logo after ~one second although I still holding the power button and dfu mode does not work.

Here is another problem, when the Iphone is stucked and I cannot reboot it, even when pressing both buttons for 30 seconds! Once in a while it reboots automatically but again get stucked after ~20 seconds.

None of these problems should apply to my phone . Do you (or anyone else) has another idea? On no stage of the whole process was the iphone ever recognized by itunes.

I have heard of similar problems with boot loop (especially with blackn0w). I'm not exactly sure why. Can you get into recovery mode at all? Restart device and hold down only home button while connected to power.

Originally Posted by Olethros

I have heard of similar problems with boot loop (especially with blackn0w). I'm not exactly sure why. Can you get into recovery mode at all? Restart device and hold down only home button while connected to power.

I managed to get into recovery mode and Itunes recognized it. For all who follow this thread, I get it off by always hold power+home button for 5 seconds and after the 100st try it turned off magically.
As far as I know it was on 3.1.3 (Blacksnowed). In the long term I want to install (pwned) 4.1, but I think this will only work in dfu mode. Which firmware should I install now, so that I do not loose the ability to unlock the phone via ultrasnow later? Standard apple 4.0?

Thank you very much for your help, I appreciate it.

Originally Posted by tobin

I managed to get into recovery mode and Itunes recognized it. For all who follow this thread, I get it off by always hold power+home button for 5 seconds and after the 100st try it turned off magically.
As far as I know it was on 3.1.3 (Blacksnowed). In the long term I want to install (pwned) 4.1, but I think this will only work in dfu mode. Which firmware should I install now, so that I do not loose the ability to unlock the phone via ultrasnow later? Standard apple 4.0?

Thank you very much for your help, I appreciate it.

When you say "blacksn0wed" do you know how it was jailbroken? Blacksn0w refers only to the unlock.

Anyway, it's quick to test by trying to restore a pwnagetool custom ipsw for say 3.1.3- if the device is currently pwned, this will work from recovery mode. Otherwise it will fail (without changing the device at all)

Thank you very much for your help.

I installed 4.0.1 and jailbreaked it with jailbreakme.com. After that I got into dfu mode via redsnow and installed a custom ios 4.1. The Iphone is unlocked via redsnow and everything works great!