The Amazfit T-Rex 3 Pro smartwatch is receiving another update. The software version 2.4.2.1 release brings improvements to integrations with two training-related apps. 4 Reviews ← exclude selected typesA new update has arrived for the Amazfit T-Rex 3 Pro, software version 2.4.2.1. The shared change log (below) states that the release brings improved integrations with TrainingPeaks and Intervals.icu. Software version 2.4.2.1 appears to be rolling out in phases to users of the Amazfit T-Rex 3 Pro smartwatch (curr.