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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 12-07-2010, 15:49   #1 (permalink)
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Downgrade iphone4 4.21 to 4.1


How i can Downgrade iphone 4 4.21 to 4.1
thanks
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Old 12-08-2010, 09:41   #2 (permalink)
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to downgrade iphone 4 simply go to c/windows/system 32/drivers/etc/host and open it with notepad and change his directory in the last add this and save notepad.now simply go to itunes and select ur ipsw file 4.1. and restore it.
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