Make/troubleshoot iPhone app to run on all iPad versions

Hi, I have an app which is supposed to run on both iPhone and iPad. On the simulator, it runs nicely on iPad 4.2. But when I change to iPad 3.2, it says it cant find the MainWindow-iPad file. Likewise, on iPad 4.3, it crashes, throwing a SIGBRT error. So what I will like you to do is to take my source code, solve the problem with the errors and make sure the app runs on ALL the devices and simulators. That is, the app must run on - iOS device - iPad 3.2 - iPhone 4.0 - iPhone 4.1 - iPad 4.2 - iPhone 4.2 - iPad 4.3 - iPhone 4.3 Please note that I will not pay until I test the app on all these platforms and it runs. Please endeavour to retain all my formatting and layout just as it is. Also, you must tell me the exact changes you made. I prefer not to use the source code from you to make the changes. Instead, I will expect you to tell me the changes in an email, and I will simply make the changes on the version that I have. For someone who is into programming, this can be a very simple job. So I am unlikely to pay $100s. Thanks