Explanation:
1.Mi Smart Band 3 Series product: slide on the band screen, slide up and down on the More--Dial.
2.Mi Smart Band 4 and 5 Series product modification: light up the band --- slide down --- More --- Dial --- click the dial style to replace.
3. Modification of Mi Fit app: My --- Mi Smart Band 4 --- Dial setting --- Dial center --- selecting the replaced dial style, click the synchronous dial.