I solve the problem. I download Uptodown in Appstore, i serch for old versions of Mi Fit and i instal an anterior version, 4.0.17. When I connected with my google user, much of the data was saved. IT works now.
It happened after installing update 4.1.1
Reinstalling the same version cannot solve the problem.
I don't know how to go back to a previous version. Is it possible?
My application mi fit does not record (or save the data of the band). Apparently the steps are correct but when you go into the details only a few have been registered.