MobileInstallation Patch For iPhone 3.0 (7A341)

Here is where you can get the file:

http://www.iphonedownloadblog.com/2009/06/20/mobileinstallation-iphone-30/

Alternatively, go to Cydia and add the following source: http://cydia.hackulo.us.

Then install the application called AppSync. This will patch your MobileInstallation file.