Over at xda-developers.com, connexion2005 has provided steps how to do this along with a video.
This is very easy to do IF you follow the instructions. I watched the video, about 11 minutes, then followed the steps. It does work. See my before and after pics.
Here is the link to the instructions: Custom Boot Screen
Galaxy-S2-Boot.jpg 30.17K 100 downloads BootLogo.jpg 93.81K 97 downloads
Edited by Gary Crutcher, 09 November 2011 - 05:13 AM.