hi guys i had to the same problem and i fixed it,,what you have to do is you can sett it to dfu mode,then go to itunes and itunes will reconise it as the iphone is on recovery mode,, then restore and update itt,, and later use tinyumbrella to safe your shsh and then downgrade to what ever version you want to jailbreak it you can jailbreak it from 4.2.1 using greenpoisen or 4.3.3 using on your iphone safari type in and your iphone would be jailbroken and you can use it again the way you want itt
Tinyumbrella 8 For Mac
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