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Old Feb 16, 2012, 08:17 AM   #1
m4rk0
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iphone stuck in dfu mode, screen black, apparently dead

guys, need some help please.

i was messing with a friend's jailbroken iPhone, i needed it in dfu mode to restore it but i probably did something wrong because phone is stuck with a blank screen and nothing can make iTunes recognize it.

it's an unlocked iPhone 4 running a jb 5.0.0 iOS.

i really can't get it to boot no matter what.
it doesn't even show under usb devices currently connected.

i left it connected to the wall charger -i read somewhere that while in dfu mode, phone isn't really charged, but someone said it helped somehow- without any success.

i'd prefer not to have apple service it because i guess they can boot it and see it has been jb.

thanks.
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Old Feb 16, 2012, 08:50 AM   #2
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Try to kick it out by using TU or redsn0w with recovery fix
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Old Feb 16, 2012, 10:38 AM   #3
m4rk0
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i tried, but neither of them can see the iPhone; tiny umbrella's buttons are grayed out.
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Old Feb 17, 2012, 11:13 AM   #4
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can anyone chime in please? this iPhone is (apparently) dead
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Old Feb 17, 2012, 12:05 PM   #5
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connect phone and hold home and power for 15 seconds, it should restart.
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Old Feb 17, 2012, 12:15 PM   #6
m4rk0
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Quote:
Originally Posted by TriJetHero View Post
connect phone and hold home and power for 15 seconds, it should restart.
doesn't work.
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Old Feb 17, 2012, 12:39 PM   #7
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tried a different computer?

What does it show when connected to TU?
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Old Feb 17, 2012, 01:24 PM   #8
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yes, i did try another computer (and another cable as well).

tiny umbrella doesn't show anything: no logs, no buttons enabled.
iTunes doesn't show any "iPhone found in dfu/recovery mode".
system information doesn't show any usb device connected to usb ports.

i really doubt i am doing something wrong here, i tried every possible combination..

Last edited by m4rk0; Feb 17, 2012 at 01:34 PM.
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Old Feb 17, 2012, 01:45 PM   #9
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With USB connected did you try to put the phone in DFU again?

Easiest way is holding power and home togeteher, count to 10 and release power, while holding home for another 7 seconds, sometimes the phone gets into a semi-off/DFU state. Looks like its completely dead, leave plugged in USB for 10 min before doing the above.
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Old Feb 17, 2012, 02:01 PM   #10
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yes, i tried it, but i will try once again.

which application should i have running while trying to put in dfu mode again? iTunes, tiny umbrella, fix recovery?

btw, i tried using "fix recovery" from http://thefirmwareumbrella.blogspot.com/ , after launch terminal.app outputs:
Code:
i7:~ m_admin$ /Users/m_admin/Desktop/fixrecovery-osx/fixrecovery43 ; exit;
Initializing libpois0n
No matching processes belonging to you were found
Waiting for device to enter DFU mode
Device must be in DFU mode to continue
[..]
i am not sure how fix recovery should be used, honestly.
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Old Feb 17, 2012, 02:04 PM   #11
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Have you tried forcing it into recovery mode.

1. Power off.
2. Hold down home button.
3. With home button held down plug in cable, connected to computer, iTunes open.
4. Continue holding home button until connect to iTunes appears on screen of phone.
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Old Feb 17, 2012, 02:18 PM   #12
m4rk0
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Quote:
Originally Posted by lgreenberg View Post
Have you tried forcing it into recovery mode.

1. Power off.
2. Hold down home button.
3. With home button held down plug in cable, connected to computer, iTunes open.
4. Continue holding home button until connect to iTunes appears on screen of phone.
i just tried but nothing happens.
this thing is possessed
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Old Feb 17, 2012, 02:26 PM   #13
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does your friend have any blobs saved?
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Old Feb 17, 2012, 03:10 PM   #14
m4rk0
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does your friend have any blobs saved?
no, he doesn't; even if he had, it's just impossible to establish a connection with the phone, that's the thing..
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Old Feb 19, 2012, 06:35 AM   #15
m4rk0
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TriJetHero

in your opinion, how many chances are there that apple has some diagnostic tools which can connect via dock connector and find out device has been jb?
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Old Feb 19, 2012, 06:40 AM   #16
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If it is dead they wont see it.

If they can revive it they will see, worst thing that can happen is they refuse to replace.

But than again, if they can revive it you can restore it.

If still under warranty try to take it back to apple.
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Old Feb 23, 2012, 05:54 AM   #17
m4rk0
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Quote:
Originally Posted by TriJetHero View Post
If it is dead they wont see it.

If they can revive it they will see, worst thing that can happen is they refuse to replace.

But than again, if they can revive it you can restore it.

If still under warranty try to take it back to apple.
yeah, that's what we did; we called apple, purchased an apple care and will get a replacement unit soon.

thank you for your help.
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Old Apr 12, 2013, 11:54 AM   #18
leighton182
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need help

hello im new here but i could do with some help a while back my iphone 4 decided to randomly turn itself off while on charge after this it just showed a blank screen will not turn on ive tried redsnow tried the reset with the home and power button tried doing that backwards leaving it on charge the only thing it does do is go into dfu mode ive also taken the battery out and put it back in nothing but the other day it did show a pic of a battery with low battery then i tried to reset it and its stuck again in dfu mode or whatever it is blank screen if anyone could help that would be great.
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Old May 19, 2014, 12:51 PM   #19
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Old thread but I guess this is an issue with the 4,4s and 5 line

1 month ago I put my 5s to charge at 50%. Left it alone for 30mins TOPS.

I came back. Black screen. Nothing worked. Nothing helped. iTunes could see it but it was in DFU. But nothing. Nothing would kick it out. Any button combo just rebooted it back to DFU with the screen black

If I restored it, the process would start, I'd get an apple logo with a progress line. Then error 40 would stop it. Tried it on 2 windows and 1 Mac with 4 USB cables. Apple said this a known issue on any phone from 4-5s regardless of iOS. That it's a HW malfunction ... Usually I'm the USB port

Even letting the phone drain out of power and turning off did not work. Plugged it in and nothing. 5 mins later, iTunes saw it in DFU. Still black screen

I think anytime, anyone gets a black screen (and button reset combos fail) and iTunes won't see it.. Or it can't be restored , it's a HW failure.
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