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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone 2 / iPhone 3G / iPhone 3GS

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Old 11-05-2008, 11:41   #1 (permalink)
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the iPhone "iPhone" could not be restored,unknown error occuerd(20)


Hi to all;
I got the following error:
the iPhone "iPhone" could not be restored,unknown error occuerd(20)
When i press power key,it shows empty battery and when connect to pc i see itune logo and usb cable,when i try to restore i get the error.plz help.
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Old 11-05-2008, 12:35   #2 (permalink)
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try this

You must put phone in dfu mode,and the try.If you have again error 20,then change pc.
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Old 11-05-2008, 14:42   #3 (permalink)
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This is just my problem,i can't take this phone to dfu mode,how can i do it manually?
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Old 11-05-2008, 14:43   #4 (permalink)
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I have the same error. The customer accidentally upgraded the iPhone to latest version and now I can restore the iPhone anytime I wish to version 2.0, but no to v1.1.4. The question is can I unlock the version 2.0 (because I am unable till now to downgrade the iPhone to v1.1.4)?

BR
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Old 11-05-2008, 14:47   #5 (permalink)
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Me too, I had big problems putting this upgraded iPhone to recovery or DFU mode. Also I was unable to shut it down. But trying with ziphone and iLiberty and all the programs, I suceeded in putting this iPhone to recovery mode, and now I can restore the iPhone anytime I wish to version 2.0, but no to v1.1.4

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This is just my problem,i can't take this phone to dfu mode,how can i do it manually?
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Old 11-05-2008, 14:52   #6 (permalink)
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Sure you can unlock it,just restore it to 2.1.0 and use quickpwn 2.1 for unlock.

BR
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Old 11-05-2008, 15:14   #7 (permalink)
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Now i got to know the real problem:

Apple Recovery (iBoot) USB Driver

i checked carefully In device manager and realized that this device is having problem.How to solve it plz?
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Old 11-05-2008, 15:16   #8 (permalink)
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Now i got to know the real problem:

Apple Recovery (iBoot) USB Driver

i checked carefully In device manager and realized that this device is having problem.How to solve it plz?
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Old 11-05-2008, 15:38   #9 (permalink)
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uninstall itune complete
restrat pc
install again itune 8.0
change usb port
restore your iphone with 2.1
and use quickpwn 2.1
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Old 11-05-2008, 18:15   #10 (permalink)
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I am still experiencing difficulties unlocking this iPhone with quickPwn 2.1. I am following exactly the instructions given by quickPwn, but at the end quickPwn displays the attached message:
Attached Images
File Type: jpg untitled.JPG (12.8 KB, 75 views)
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Old 11-05-2008, 19:33   #11 (permalink)
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Remove U Itunes And Install It Again Then Put U Iphone IN D.F.U Mode Then
Try To Restore It Again
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Old 12-01-2008, 00:13   #12 (permalink)
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iphone 1st generation

hi does the quickpwn21 work for the 1st generation iphone. I get the same problem. a friend updated the laster version and now can't downgrade. thanks.
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