Got an iphone 4 16GB here on 4.2.1, jailbroke it and installed the appsync patch. Have a small problem though with angry birds, it won't run. It's v1.5.0 and the nfo doesn't say you have to do anything special, just copy to itunes library and sync. Done it, it installs fine, but it won't launch, just black screens for a few seconds then back to home. Tried a few other games and they are fine, just seems to be angry birds that won't launch . Any one know why it won't run and how to fix it?