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

Zepp Life - Apps on Google Play

TomTop : Get the Xiaomi Mi Band 8 (China Version without NFC) for only €39,98 with free shipping - News by Xiaomi Miui Hellas

How to Sync Strava With Mi Band Without Any Third-Party App - TechWiser

Review: Mi Band Pulse Fitness Tracker (XMSH02HM)

Mi Fitness (Xiaomi Wear Lite) on the App Store

Migrating Data from Zepp Life to Mi Fitness? : r/miband

Third party data on mi fitness : r/miband

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

How to remove zepp life message? : r/miband