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After one or more developer beta builds, Apple releases a new public beta build to users participating in the Apple Beta Software program.The first release of any iOS version is exclusively made available for developers to test out.
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It also serves as a way for Apple to iron out the notorious bugs and glitches to ensure a smooth and stable rollout. The main goal of a developer build is to make sure app developers can access the latest software and optimize their apps before the final public release.
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The developer beta of an iOS update is an early experimental build of the software, primarily intended for developer use.
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