Currently Mi Band 8 (China Version) only work with Mi Fitness app. You can't transfer old data from Zepp Life to Mi Fitness if you are not in china region because of

Xiaomi Mi Smart Band 8 (Global Version) Health & Fitness Tracker with 60Hz Refresh Rate 1.62 AMOLED Display, 16-Day Battery Life, 150+ Sports Modes, Blood Oxygen, Heart Rate,Sleep & Stress Monitoring

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