Source: Simple Amazfit Watchface Builder
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Amazfit Stratos firmware update 2.3.9.1 solves GPS & heart rate problems
Participants of the Amazfit Stratos beta platform have received firmware 2.3.9.1 for testing. The new update fixes GPS accuracy & heart rate sensor issues. Source: Amazfit Stratos firmware update 2.3.9.1 solves GPS & heart rate problems