Question Mi Band 3 (hankou h/w) heart rate detection frequency

[unistylist]

Hello?

I used the wuhan version of Mi Band 3 before and recently I bought a new Mi Band 3.

this one's hardware revision is hankou. not the same as the former one.

the odd thing is when I set heart rate detection frequency at the mi fit app (the latest version)

1min option has disappeared and now 10 min and 30 min options are only shown in the app.

How come this happen? I don't know how to fix this problem.

Thanks in advance!!