I found a solution, I used the firmware version 1.5.0.2 from this other post, and evering runs perfect!!!
Firmwares 1.5.0.2 | Mi Band 3 NFC | Spanish, Turkish, Thai... | Xiaomi Mi Band 3 | GeekDoing
HI,
I successfully install the firmware version 1.2.0.30 thanks to the app "Notify & Fitness". The problem comes when the MI Fit app recognize the Mi Band 3 NFC and always update the firmware back to 1.5.0.2 and it bring the chinese language again.
Should I Uninstall the Mi Fit app, or there is...