How can mi band not be optimized?

If you don't want to optimize, you can choose to downgrade.

Downgrading steps: firstly uninstall the latest version of Xiaomi Sports app, then install Xiaomi Sports app in the resource and log in. Finally, the rice band is bound. After successful binding, after the bracelet is automatically degraded, the mi band can be used normally.

You need an Android phone or an iPhone4s running iOS7 and above to operate.