Phone with English language, localization Portugal, original Mi Fit App.
Mi Band 3 NFC with original 1.6.0.10 firmware
1. Install "Notify and Fitness for Mi Band"
2. Download “Modified Date Firmware”
3. Open "Notify and Fitness for Mi Band", Settings, Tools, "Upgrade Custom Firmware" and gave the file from the previous step.
Everything working. All in English except Weather.
Thanks Magical Unicorn