Weekly Update And Manually Update

Apr 9, 2016
Hello ! I have read some posts here, altough I learned some great stuff, didn't quite get it clear.
My last update recived automatically was 6.1.7, I have Mi Note Pro, and the Rom it seems to develop a mind of it's own :D.
So now I guess I have to update it manually, and I am not very sure how to do it right.
If someone can spare some time and help, many thanks in advance :D