On July 7, 2026, Apple rolled out the third beta update (internal build number: 26A5378j) of macOS 27.0 Developer Preview to Mac users worldwide, marking a 14-day interval since the previous Beta/RC version. This latest iteration refines the liquid glass visual effects, offering a more immersive and fluid user experience. Additionally, it introduces two captivating dynamic wallpapers: "Golden Gate Sunset" and "Golden Gate Nightscape," which not only enhance the aesthetic appeal but also support unlock animations and screensaver functionalities, adding a touch of personalization and dynamism to the Mac interface.

Furthermore, this article serves as a comprehensive guide for developers and enthusiasts alike, detailing the upgrade procedures for the developer and public beta versions across iOS, iPadOS, watchOS, and macOS platforms. It also includes convenient links to download historical firmware for Apple iOS devices, as well as a chronological overview of macOS 27's release history. Stay tuned to IT Home for in-depth coverage of the specific update contents, and we encourage users to share their insights, discoveries, and feedback through articles or comments, fostering a vibrant community of tech explorers.