We have a good news that now the app supports updated version of Mi Band XMSH03HM (the one with white LEDs). We have changed communication mechanism for both types of Mi Band, so if you see issues, let us know via email! The update will arrive to you during day-two.
There are two limitations for updated Mi Band: you can't change color theme (because there are no more color LEDs :)) and Live Tile updates don't work with app closed. Soon Live Tile may be not working for older version also... But we are already working on big app redesign that will bring many new features! It will take some time, but you will be really glad about it!