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Go Back   GSM-Forum > GSM Mobile / Tablets Brands -Software Area- > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone, iPad, iPod Hardware Repair

iPhone, iPad, iPod Hardware Repair Hardware Repair discussions for iPhone, iPod , iPad & Apple Products, help, guides.

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Old 06-09-2012, 10:59   #1 (permalink)
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iphone 4 error 21

i need help how solve error 21

i restore in dfu mode and recovery too but same problem

i disconnect battery and change too but same problem

help me how solve that problem

It is Not Solve in Software

Give me hardware solution
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Old 06-10-2012, 12:21   #2 (permalink)
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Error 21
Custom firmware restore fail (PwnageTool since 4.1). You have to put your device into the DFU mode and not into recovery mode. Device won't boot correctly an stuck at the Apple logo after the error. Press and hold power and home button until it reboots.
Error when using Sauriks server for a restore with iOS 5.x in the recovery mode at least on a A5 device.
This error can also happen when you try to restore an iPod with hardware dfu. Use iREB r5 to solve this.
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