Apple has rolled out iOS 18.6.1, a minor update for iPhone users, focusing on a single key feature: the return of Blood Oxygen monitoring for select Apple Watch models in the U.S. Released on August 14, 2025, with build number 22G90, this update addresses a specific issue stemming from a patent dispute, offering no additional features or security patches. This concise article details the update’s purpose, functionality, and implications, tailored for iPhone users seeking clarity on what’s new. What’s New: Blood Oxygen Feature Restored The primary change in iOS 18.6.1 is the reintroduction of a redesigned Blood Oxygen feature for U.S. users of Apple Watch Series 9, Series 10, and Ultra 2, paired with watchOS 11.6.1. Key details: Background: A...