I think that if you install the latest 8.8.30 you will have no problems.
I made the same and nothing happend.
If you make a mistake or something you could use miflash to fix it.
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I am with the 8.8.30 and that android system is consuming a lot of battery.
And I also cannot open certain apps like dropbix, feedly etc. They crash when I try to open them.
Enviado desde mi MI MAX 3 mediante Tapatalk