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Apple's beta program has reached the second developer beta round foriOS 15.6, iPadOS 15.6, tvOS 15.6, and watchOS 8.7.
The latest builds can be downloaded from the Apple Developer Center for participants in the Developer Beta program, as well as via an over-the-air update for hardware already used for beta software. Public beta versions of the developer builds are usually issued within a few days of their counterparts, and can be acquired from the Apple Beta Software Program site.
Apple also released HomePod Software Update 15.6 for developers in the closed beta testing program.
So far, it is unclear exactly what features are being changed in the current generation of betas. It is likely that they will be bug fix and performance improvement releases, due to the expected WWDC announcements for new milestone versions.
The second build number for iOS 15.6 and iPadOS 15.6 is 19G5037d, replacing 19G5027e. The tvOS 15.6 and HomePod software build has updated to 19M5037c from 19M5027c. Lastly, the second watchOS 8.7 beta build is 19U5037d, taking over from 19U5027c.
AppleInsider, and Apple itself, strongly advise users avoid installing beta software on to "mission-critical" or primary devices, due to the small possibility of data loss or other issues. Instead, testers should install betas onto secondary or non-essential devices, and to ensure there are sufficient backups of important data before updating in the first place.