Auto update changes it back to chinese. Firmware is updated to .14 version. Reflash with the .12 update doesn't help. After reboot and connection with the mi fit app, it will start auto update. That will undo the flash.
Works very well. Only the step count is a kind of slow. It takes some time until the amount of steps is updated. Everything is in dutch. And my dutch is way better then my chinese. ;)