Update iPhone 4 iOS 4.2.1 without Baseband 1.59.00 Upgrade

If you update iPhone 4 to iOS 4.2.1 then your baseband will also upgrade to 03.10.01 and at the moment you can't unlock this baseband. Here is the solution, how to update iPhone 4 to iOS 4.2.1 without updating its baseband. We can achieve that using TinyUmbrella. Lets see how to preserve iPhone 4 baseband [...]