Apple has rolled out the third beta updates for the upcoming iOS 17.5, iPadOS 17.5, and macOS Sonoma 14.5 to developers, right after the second beta updates, which Cupertino rolled out last week.
The third beta updates for iOS 17.5 and iPadOS 17.5 have build number 21F5063f. Meanwhile, macOS Sonoma 14.5 beta 3 comes with build number 23F5064f.
In addition to these third beta updates, Apple also rolled out the third release candidate for two older versions of macOS. The third RC for macOS Monterey 12.7.5 and macOS Ventura 13.6.7 comes with build numbers 21H1216 and 22G716, respectively.
How to install the third betas of iOS 17.5, iPadOS 17.5 or macOS Sonoma 14.5?
First of all, you need to make sure that you are enrolled in the Apple Developer Program. Moreover, these beta updates are not for general users but also for developers. So as a regular user, you should ignore these updates as they could make or break your device.
To install the third beta of iOS 17.5 or iPadOS 17.5 on eligible iPhones or iPads, go to Settings > General > Software Update. Next, make sure you have iOS 17 or iPadOS 17 Developer Beta selected. Now go back to the main software update page and wait for a moment. Once the iOS 17.5 or iPadOS 17.5 beta 3 update appears, click the Download and Install button.
As for Mac users, the Sonoma 14.5 beta 3 update can be installed by clicking on the Apple menu (located in the upper left corner), then navigating to General > Software Update. Then, click Update Now to start downloading the macOS Sonoma beta 3 update once it becomes available. The system will reboot once the update is complete.