Download tinyumbrella 4.21.07 for your iphone
Notcom, the developer of TinyUmbrella has released the 4.21.07 version of TinyUmbrella to save iOS 4.2.1 SHSH Blobs. You can now safely upgrade to iOS 4.2.1 while preserving the 1.59.00 basband on your iPhone 4 for unlocking using ultrasn0w.
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