Downgrade your redmi note 4 to previous miui with recovery rom file easily.
1. charged mobile 70% atleast.
2. download prev. version miui from officail site. i.e.
http://en.miui.com/download.html
3. do a factory reset.
4. copy downloaded rom in your phones internal storage not sd card
5. go to about phone check for system update
6. tap on 3 dots upper right side of your phone
7. choose update package browse in file manager go to interenal storage select previous miui
8. wait for min. getting info appear than decrypting
9. messgage pop-up update