How to check the System version, Bluetooth and SN on the Xiaomi Smart Band 8?

Method 1:
You can check the information on the band by tapping [Settings] >> [About].
Method 2:
If the Xiaomi Smart Band 8 has been connected to the Mi Fitness APP, you can also check the information in the Mi Fitness APP by opening the [Mi Fitness] APP >> [Device] >> [About].