also.. you can check if the rom you want to rollback does not brick ypur device with the "anti-rollback" system that xiaomi create...
use the cmd command "
fastboot getvar anti" on fastboot mode, you will get a number (0,1,2,3,4) and check your rom that has the same or higher number....
for example:
if your device shows "anti: 2" you can only flash (trought miflash tool) roms with anti_ver_ : 2,3,4)
on the scripts of your stock rom "clean all *save user-data *clean all and lock you can check the anti rollback version of the rom by using notepad++ and looking something like this