Can you make an iPhone OS 2.x app compatible with iOS 4.x without access to the source code? [closed]

It's difficult to tell what is being asked here.开发者_StackOverflow社区 This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 10 years ago.

I have some apps that where created for iPhone OS 2.x, and I really want to make them compatible with iOS 4.x / iOS 5.0.

The only problem is I don't have the source code. Is there a way to bring these apps up to date and make them compatible with modern iOS versions if I don't have the original code for them?

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please forget of porting. porting means upgrading your old source code according to new software version and in your case there is no source code.

fresh development is the only solution left for you i'm afraid!