Sn0wbreeze 2.9.14 is safe to jailbreak iPhone 3GS on iOS 6.1.3?

And what is a difference between downloading iOS from different link and downloading it from iTunes?

It's safe and it's the way to unlock, jailbreak and activate your phone. Downloading from itunes means for one time only and from other sites means you can keep backup file.

Yes it safe and you can use it!

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