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Apple has arrived at the fourth beta round, seeding new iOS 15.4, iPadOS 15.4, tvOS 15.4, and watchOS 8.5 builds to developers.
The latest builds can be downloaded by developers in the beta-testing scheme via the Apple Developer Center, or as an over-the-air update for hardware already using earlier beta builds. A public beta version of the releases is expected to start arriving soon, and will be available through the Apple Beta Software Program website.
On iPadOS 15.4, the operating system supports Universal Control, so a Mac user can extend their workspace and use a keyboard and mouse connected to a Mac to interact with the iPad.
AppleInsider, and Apple itself, strongly insist users avoid installing the betas on to "mission-critical" or primary devices, as there is the very small chance of data loss or other issues. Instead, testers should install the betas onto secondary or non-essential devices, and to ensure there are sufficient backups of any important data before performing the update.