My iphone 4 won't jailbreak for nothing?

I have an iPhone 4 6.1.3. And I have tried many times to jailbreak it. I have watched many videos and did EXACTly what they did. When I use redsn0w after I put my iphone into dfu mode. It says uploading first stage. Then second stage. Then when it comes to "waiting for reboot" it does nothing. I have even tried on different computers!

Its a teathered jailbreak, mean you need to boot with the redsnow app everytime you restart your iphone.

I think apple put a bug fix in iOS 6.1.3 so you can't jailbreak it

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