Apple issues fourth developer builds of iOS 12.3, tvOS 12.3, macOS 10.14.5, watchOS 5.2.1

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Apple has moved on to its fourth round of betas for this cycle, providing developers testing its operating systems new builds of iOS 12.3, tvOS 12.3, watchOS 5.2.1, and macOS 10.14.5, as well as a third build of new Apple TV software
AppleInsider – Frontpage News