Apple Watch Series 12 Gets Urgent watchOS 27.0.1 Update to Fix Restart Bug

Apple has released a new software update for its latest smartwatches after some Apple Watch Series 12 and Apple Watch Ultra 4 owners reported unexpected restarts.

The company has rolled out watchOS 27.0.1, a minor but important software update designed to fix an issue that could cause affected Apple Watch models to restart unexpectedly. The update is available specifically for the Apple Watch Series 12 and Apple Watch Ultra 4.

Apple Watch Series 12 Restart Bug Fixed

The restart issue appeared shortly after Apple's latest smartwatch models launched with watchOS 27.

Some owners reported that their Apple Watch would suddenly display the Apple logo and reboot during normal use. Reports indicated that unexpected restarts could happen while users were editing watch faces, making phone calls, using Siri, opening Apple Maps or the App Store, and recording workouts. Some users also reported restarts when the watch was apparently idle.

Apple has now addressed the problem with watchOS 27.0.1.

According to Apple's release notes, the update includes bug fixes and specifically resolves an issue that could cause the Apple Watch to restart unexpectedly.

Which Apple Watch Models Are Affected?

The watchOS 27.0.1 update is currently intended for two newer Apple Watch models:

• Apple Watch Series 12
• Apple Watch Ultra 4

Apple has not indicated that older Apple Watch models require this particular update.

If you own one of the affected models, installing the latest software is recommended, particularly if you have experienced unexpected restarts.

What Caused the Apple Watch Restart Problem?

The exact technical cause has not been publicly explained by Apple in its release notes.

However, diagnostic reports from affected users pointed toward a possible problem involving the Apple Neural Engine. Some diagnostic logs showed a Neural Engine timeout occurring before the watch experienced a kernel panic and restarted.

Reports indicated that the issue could occur during a variety of activities, including Siri-related functions, Maps, phone calls, watch-face editing and workouts.

Apple's official update documentation simply states that watchOS 27.0.1 fixes the unexpected restart issue, without providing a detailed explanation of the underlying cause.

How to Install watchOS 27.0.1

Apple Watch Series 12 and Ultra 4 owners can check for the update directly from their watch.

Update From Apple Watch

1. Open the Settings app on your Apple Watch.
2. Tap General.
3. Select Software Update.
4. Wait for watchOS 27.0.1 to appear.
5. Tap Install.
6. Follow the instructions displayed on the screen.

The Apple Watch should be placed on its charger during installation and have at least 50% battery.

Update Using an iPhone

You can also install the update through the Apple Watch app on your paired iPhone:

1. Open the Apple Watch app.
2. Tap General.
3. Select Software Update.
4. Check for watchOS 27.0.1.
5. Download and install the update.
6. Keep the Apple Watch connected to its charger while the installation completes.

Why This Update Is Important

Unexpected restarts can be particularly frustrating on a smartwatch because they can interrupt activities such as workouts, calls, navigation and other tasks.

For example, a restart during a workout could interrupt tracking, while a reboot during a phone call or while using navigation could temporarily interrupt the user's activity.

The release of watchOS 27.0.1 gives affected users a software-based solution without requiring a hardware replacement in cases where the problem was caused by the reported software issue.

Is watchOS 27.0.1 a Major Update?

No. watchOS 27.0.1 is a minor bug-fix update, rather than a major feature release.

Apple released it shortly after watchOS 27 became available. Its primary purpose is to address the unexpected restart problem affecting the newest Apple Watch models.

Users should therefore not expect major new features from this update. Instead, the focus is on improving stability and resolving the restart problem.

Apple Watch Series 12 Users Should Check for the Update

If you own an Apple Watch Series 12 or Apple Watch Ultra 4 and have experienced random restarts, checking for watchOS 27.0.1 should be one of the first troubleshooting steps.

The update is specifically designed to address the problem, and Apple has made it available for the two affected models.

Keeping the watch updated can also help ensure that other software bugs are addressed as Apple continues to refine watchOS 27.

Final Thoughts

Apple has responded to reports of unexpected restarts on the Apple Watch Series 12 and Apple Watch Ultra 4 with the release of watchOS 27.0.1.

The update focuses on fixing the restart bug that affected some users shortly after the launch of the latest Apple Watch models. While Apple has not publicly provided a detailed explanation of the underlying cause, diagnostic reports have pointed toward a possible Neural Engine-related timeout.

For Series 12 and Ultra 4 owners, checking for watchOS 27.0.1 is a simple way to make sure the latest stability fix is installed.