The latest release of the GreenPois0n jailbreak for iPhone 4.2.1 comes with a nice little surprise: you can now add animated boot logos to your iPhone. We already showed you how to do this manually, today we're going to show you how to do this directly from Cydia.
In order to do that, you'll obviously need a jailbroken iPhone on iOS 4.2.1, either using GreenPois0n (see our tutorial), or the tethered version of RedSn0w. You will not be able to install animated boot logos unless you are on 4.2.1 jailbroken iPhone with GreenPois0n or RedSn0w tethered...