Here are the steps that has to be follow in-order to change your iPhone Boot Logo without the need of Reinstalling
The first step require you to launch Cydia by tapping its icon on the Springboard and than select the Sections tab at the bottom of the screen.
Again press the Confirm button i.e on the top right of the screen.
Now enter a url for your bootlogo. Foe example, http://www.macpeer.com/files/macpeer-bootlogo.png for macpeer boot logo. If you want you can use different logo.
After inserting url, select the Download button to download the specified Boot Logo to LogoMe. Once it has finished you can press to select the Install Logo tab at the bottom of the screen.
The next time you boot you will see your new Boot Logo in place of the previous one.