Fitbit's Versa 4 isn't much of an upgrade over the Versa 3 and is plagued by lousy fitness tracking accuracy and a lack of third-party app support.

Google is rolling out a firmware update to a “limited number” of Fitbit Sense and Fitbit Versa 3 devices. These devices are said to be at risk of their batteries overheating.

This is in addition to offering everything else found on the Versa 4. Meanwhile, the Versa 4 is a minimal upgrade over Fitbit's older-gen Versa 3 and has some connectivity and tracking issues.

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