What you need to know
- Pixel Watch 3 and Pixel Watch 4 users report broken SpO2 and skin temperature tracking after Fitbit firmware version 3.57.1.2.910093395.release.
- The update reportedly removes sensor permissions, and users cannot re-enable them because the system says no app is requesting access.
- Google has acknowledged the issue and says a fix is in the works.
Google recently launched the Fitbit Air, a new screenless tracker designed to be an easy entry point into its revamped health ecosystem. However, as Google tries to lure more users, a recent software update is causing major problems with health tracking on its top wearables.
If you noticed missing health data on your watch recently, you aren’t alone. Many Pixel Watch 3 and Pixel Watch 4 owners say their devices have stopped tracking blood oxygen (SpO2) and skin temperature (via Android Authority).
The culprit seems to be a recent Fitbit firmware update (version 3.57.1.2.910093395.release), which has a bug that quietly removes sensor permissions. When users try to turn these permissions back on in their watch settings, they are greeted with a system message stating, “no app is requesting permissions,” so they cannot restore access. This software issue leaves the hardware unable to work properly.
Premium hardware, broken software
People on forums like Reddit are understandably frustrated. One Pixel Watch 3 owner shared that similar update problems have happened to them about 10 times in the past 10 months. They said the software is so unreliable that it feels like being an unpaid beta tester for unfinished products.
In another thread on r/fitbit, Pixel Watch 4 users are also reporting the same bug. Some have been missing important sensor data for more than a week.
Since SpO2 and skin temperature are tracked in the background, you might not notice if your watch stops recording them until you check the Fitbit app. This means you could lose several days of health data without any clear warning.
Google is promising that a fix is being worked on. The official PixelCommunity account posted on Reddit to admit the problem, saying, “We regret the disruption to your health tracking experience caused by these permission resets.” A Fitbit representative has also said they are working to restore sensor access.
Some users have found that restarting their smartwatches can help for now. It is also a good idea to check your dashboard often to make sure your data is syncing correctly.
Android Central’s Take
This situation shows both the good and bad sides of modern smartwatches. Features like SpO2 and skin temperature tracking can really help users notice changes in sleep quality, recovery, or overall wellness without any extra effort. This kind of passive health tracking is a big reason people spend so much on wearables. But when a simple software update suddenly breaks those features, it is a reminder of how fragile the smart experience still is in 2026.