With opening the latest Xcode 6 (6.4), you'll see you can set the deployment target back to 4.3.As the deployment target is the minimum supported iOS version, your app needs to run on all iOS versions including both 32-bit and 64-bit if available,and needs to run on all models of iPhone/iPod touch/iPad which work with any of the versions you specified.And to test your app, Xcode 6 does not provide simulators of older versions, you need actual devices.
Topic:
Developer Tools & Services
SubTopic:
Xcode
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