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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone 4 / iPhone 4S

iPhone 4 / iPhone 4S iPhone 4 / 4S

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Old 09-02-2013, 10:47   #1 (permalink)
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iphone 4 is giving error 21 while restoring


Hello,

Please can you give any advice on this ?

BR
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Old 09-02-2013, 11:47   #2 (permalink)
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Google works fine, just ty it !
iTunes: Specific update-and-restore error messages and advanced troubleshooting
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Old 09-02-2013, 12:13   #3 (permalink)
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I have already tried my friend.
Any other advice ?
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Old 09-02-2013, 12:19   #4 (permalink)
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Quote:
Originally Posted by manistar View Post
Hello,

Please can you give any advice on this ?

BR
Restoring from version XX to XX ???
Provide more details .
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Old 09-02-2013, 12:42   #5 (permalink)
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The phone had 6.1.3 because i have factory unlocked it.
It seems that during some apps installing ios crashed ( *******r saying ) .
Now i want to restore back, but is giving error 21.
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Old 09-02-2013, 13:04   #6 (permalink)
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try to change something: PC, cable, battery...
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Old 09-02-2013, 13:52   #7 (permalink)
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Just make sure you tried software steps and not success. iTunes error 21 is cpu error. You need reball it with stencil.
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Old 09-04-2013, 15:53   #8 (permalink)
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Update itunes

Change usb try other usb port slot pc

Hang battery in 15 to 30 mins restore again

Cut host...dfu mode. .....Try other pc
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Old 09-05-2013, 00:05   #9 (permalink)
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Wink

Quote:
Originally Posted by =POWERPHONE= View Post
Update itunes

Change usb try other usb port slot pc

Hang battery in 15 to 30 mins restore again

Cut host...dfu mode. .....Try other pc
he is right, all of them are right, try to change, the problem might be one of the ports or pc
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