How to install android os on iPhone 4 running 5.1.1?

I have an iPhone 4 and I'm running 5.1.1, I know you can use bootlace on earlier versions of ios to install android os, but I like iOS 5 much more then ios 4, I'm just wondering if there's anyway of downloading bootlace on ios 5.1.1

Jailbreak it with greenpoison then look on cydia there should be a android os

You can find some steps from here-

http://yuwienetwork.blogspot.in/2012/06/install-siriport-ios-511-iphone-4-3gs.html

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