Similar to what Cydia was for the earlier ones, Appsync is the one which helps you install the unofficial and cracked apps and games in your iPhone, and also on the iPad. The new version of its, the Appsync 4.0 has been successful in doing the same for the new iOS4 Golden Manager candidate which is the only available version for developers right now.
Though the jailbreak and unlock teams still don’t guarantee with everything, as there is a risk of loss of baseband, still if you are good enough and want to try, the Appsync 4.0 can be used to install cracked apps in your iPhone with iOS4 firmware.
To do this, you should do the steps that I explained earlier to jailbreak iPhone 3GS with iOS4, and then open Cydia.
In Cydia, add –
http://cydia.hackulo.us
Then you would see Appsync 4.0 in your iOS4. This is possible right now in only the iPhone 3GS, the jailbreak for which is possible through the Pwnagetool bundles and redsn0w 0.9.5 as explained in my previous tutorial.
Note: Don’t try to jailbreak any other generation mobile than iPhone 3GS, its better to wait until the fully functional jailbreak and unlock tools are released.