iphone - Will old source code run with SDK 4.2? -

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i've been working on creating own iphone app source code company gave me. code created iphone sdk 3.0. i've worked on over year (i'm designer coding copy , paste) , test app on iphone says must update sdk 4.2. i'm wondering break app? don't have skills in xcode upgrade code if required rewrite parts.

thanks,

chris

if none of code has been deprecated, changed or removed, chances still runs fine. projects run, , if have used external code (and noted got from) there might update available piece of code.


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