Installing iOS 6.1.3 on iPhone 4?

How can i Install iOS 6.1.3 on iPhone 4 from iOs 7?
Please ANSWER IF KNOWN.

Downgrading from IOS7 is now impossible as Apple are no longer signing anything bellow IOS7. When you start to install and update when it says verifying update what it is actually doing is connecting to the apple servers and asking if you're allowed to upgrade. As Apple have stopped signing old firmwares it will deny access to the update there giving you a load of errors and still having IOS 7.

The worst mistake in your life was buying a Apple iPhone, you have now to play their game which you will never win, One day you will wake up to the fact that the only thing Mac wants is your money nothing else your just a cash cow to them that they can milk your bank account dry.

As of iOS 6.1.3, it is impossible to downgrade.

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