I have submit my app in app store successfully and got approve from apple but the app Development Targer is 5.0 and developed in Xcode 4.2.1(mac os x). So its not installed in IOS 4 devices from app store, now how can i solve this problem and get run on all (i.e) from IOS 3 devices.
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You will need to set the deployment target to whatever minimum iOS version you want to target. You can set this in your Project’s Target, as in the screenshot below:
However, it’s a good idea to keep the Base SDK at the latest released version; which is currently 5.1:
Note, in order for people to now be able to download your app on the new minimum version, you will need to reupload a new binary to the App Store for review and acceptance.