After the update my gtr4 watch battery drains completely after 2 days (instead of the 2 weeks that used to last). I haven't changed any setting, I'm sure this is some issue with the Zepp app, since I moved to Notify the battery last a bit longer (roughly a week). I'll end up getting rid of the watch if I have to recharge it too often.
Amazfit has released firmware version 5.0.2.1, an update available for the Amazfit GTR 4 and GTS 4. Not only does the new software address multiple bugs for the pair, but it also introduces a new heart rate algorithm designed to improve accuracy during workouts.