TinyUmbrella has been updated to support iOS4.2.1.As reported by iPhone Download Blog, TinyUmbrella is a programme for Windows and Mac that lets you save the SHSH Blobs for your iPhone, iPad or iPod Touch.
It's for jailbreakers who may want to revert a previous iOS version. SHSH Blobs are tiny text files that identify your device and are needed because Apple doesn't support going back to previous operating systems.
Basically, if you're a jailbreaker, download TinyUmbrella, and save your Blobs - you may need them in the future.
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