Apple sends emergency update to fix nasty bug affecting Apple Watch Series 12, Apple Watch Ultra 4

With the latest Apple Watch models restarting repeatedly, Apple quickly sends out an emergency update.

The Apple Watch Series 12 was just released last week.
Apple sends emergency watchOS 27.01 update. | Image by Apple
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Those who bought the recently released Apple Watch Series 12 and Apple Watch Ultra 4 received an emergency update yesterday. Apple rushed out watchOS 27.0.1 to exterminate a nasty bug that was causing the two timepieces to restart repeatedly and without warning. The update was released exclusively for the two Apple Watch models.

Apple Watch Series 12 and Apple Watch Ultra 4 users should install watchOS 27.1 ASAP


Apple is telling Apple Watch Series 12 and Apple Watch Ultra 4 users to install the update immediately. No sooner had Apple started to ship the new timepieces than multiple reports appeared on social media from device owners complaining that their new wearables were suddenly restarting.


Apple admitted that the issue was real by including it in the release notes for the update. And don’t for one second go around and think that this is not a serious problem, especially for a device like an Apple Watch.

This might be a more serious issue than you might believe


Users set alarms and timers so as not to miss important appointments or accidentally fail to take a dose of their medication. People really rely on their Apple Watch to manage their workouts, monitor their heart rate, and blood oxygen readings. There is also the fall detection sensor, and other health-related features.

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If your Apple Watch Series 12 or Watch Ultra 4 seems ok, what will you do?
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With the bug, users said that their timepiece would suddenly reboot while they were doing things like making calls, using Siri, customizing watch faces, or recording workouts. A post on an Apple forum suggests that a Neural Engine timeout is responsible for the repeated restarting.

A timeout that took 20 milliseconds longer than it should was the cause of the restarts


A command related to a Neural Engine timeout took 20 milliseconds longer than its 2,000-millisecond limit, which forced the watch to reboot. This bug was exterminated with the watchOS 27.01 update.

How to install iOS 27.01 on your Apple Watch


To install the update, first make sure that your Apple Watch is connected to a Wi-Fi signal and has at least 50% battery life remaining. From your iPhone, open the Watch app and tap the My Watch tab. Then click on General > Software Update.

If you prefer, you can install the update directly on your Apple Watch by opening the Settings app and then go to General > Software Update. Tap Install or Download and Install. From that point, leave your Apple Watch on the charger until it restarts on its own.

Not every Apple Watch Series 12 and Apple Watch Ultra 4 unit was affected by the bug. But no matter whether your timepiece has been restarting or not, it probably is a good idea to install the update anyway.

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