iOS 18.6.1 Update: Blood Oxygen Returns but Users Report Issues

Apple has officially released iOS 18.6.1 on August 15, 2025, and it has quickly become a trending topic in the United States. The update has sparked a mix of excitement and concern among iPhone and Apple Watch users, making it one of the most talked-about software releases in recent months.

The biggest highlight of iOS 18.6.1 is the return of the Blood Oxygen Monitoring feature for Apple Watch users in the U.S. This feature had been disabled for over a year due to an ongoing patent dispute between Apple and medical technology company Masimo. With this new update, Apple has brought the feature back in a slightly modified form. The measurement now takes place on the iPhone rather than directly on the watch, and results are available only through the Health app. Although this change makes the process less seamless, the restoration of the feature has been welcomed by many Apple Watch users who had been waiting for its return.

Well-known tech reviewer Aaron Zollo, who runs the popular channel Zollotech, confirmed on X (formerly Twitter) that iOS 18.6.1 delivers this new Blood Oxygen experience. His post added credibility to Apple’s official release notes, reassuring users that the feature is indeed back in action.

However, not everything about iOS 18.6.1 has been met with enthusiasm. Soon after the update went live, some users began reporting serious issues. A post by LeakCore on X warned others not to install the update, citing major problems such as battery calibration errors, disrupted SIM connections, and general network instability. These reports suggest that while iOS 18.6.1 reintroduces a long-awaited feature, it may also bring along new headaches for everyday users.

The reason this update is trending so heavily in the United States is simple. On one hand, it restores a key health feature that Apple Watch users had been missing. On the other hand, the potential risks—ranging from faster battery drain to connectivity problems—have raised alarms. This contrast between anticipation and frustration has made iOS 18.6.1 a hot topic across social media and tech forums.

So, should you install iOS 18.6.1 right away? The answer depends on your priorities. If you rely heavily on the Apple Watch’s Blood Oxygen feature and have been waiting for its return, the update may be worth it. But if stability, battery life, and network performance are more important to you, it might be wise to hold off for a few days and see if Apple releases a follow-up patch to address these issues.

In conclusion, iOS 18.6.1 is both promising and problematic. It demonstrates Apple’s effort to balance legal challenges with user demands by reintroducing an important health feature in a modified way. At the same time, reports of technical problems show that the update is far from perfect. For now, the safest approach is to back up your data and wait to see how the broader community responds before making the jump.