I had used the hack to jail break my iPhone 4. At the time my OS was 4.0. Last night I updated my OS to 4.0.1 and lost cydia. And I have tried to go to the website and reinstall it but it won't work and automatically brings me back to my home screen. Is there any way to get cydia back on my iPhone or have I completely messed it up. Please help me if you have any solutions. Thank you!