I downgraded my mi band 4 from firmware version 1.0.9.66 to 1.0.7.60 . My question is: can I factory restore it without mi fit update back to the latest firmware?
if you want to update it again Mi Fit will do it if you pair the band. if you want to do this in another way you can do it manually with Notify Lite for Mi Band for example. but you have to download the firmware+res files first too.