Apple is moving on with its developer beta program, with new fourth builds of iOS 27, macOS 27, tvOS 27, watchOS 27, visionOS 27, and iPadOS 27 now undergoing testing. The third developer builds arrived on July 6, while the second occurred on June 22 for most of the operating systems. The first developer builds of iOS 27, iPadOS 27, macOS 27, tvOS 27, visionOS 27, and watchOS 27 were made available on June 8. The fourth builds are:iOS 27 beta 4 is 24A5390f, replacing 24A5380hiPadOS 27 beta 4 is 24A5390f, replacing 24A5380hmacOS 27 beta 4 is 26A5388g, replacing 26A5378jtvOS 27 beta 4 is 24J5325d, replacing 24J5315iwatchOS 27 beta 4 is 24R5325h, replacing 24R5315ivisionOS 27 beta 4 is 24M5326g, replacing 24M5316kThe initial changes included tweaks to Liquid Glass, the long-awaited overhaul of Siri, child-protective features, and many other smaller changes. The second iOS 27 developer beta included an update to Apple TV in the Home app, showing it like a connected HomePod or HomePod mini.