What is my iPhone firmware version?

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IPod DFU mode
Ipad DFU Mode
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[Redsnow for iPhone 3GS]
[Redsnow for iPhone4]
[Redsnow for iPod]
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Ultrasnow Download

Redsnow vs ultrasnow

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How to use Redsn0w

Redsn0w error
When you try to jailbreak or unlock your iPhone you must know about your device firmware version
If your device firmware version is high (just like 5.0 ,5.0.1), you can available more new features
You can check your device firmware version like this
Go to settings, General then press about

You can find your device firmware version under version tab
My firmware version
If you can't on your iPhone, iPod or iPad, you can use iTunes to check your Mobile firmware version
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