Which Rom? And How?

[eddie1967]

Hello to everyone, i need some help with miui.
I just bought for my mom a MI 4 LTE-CU, it comes with:

Miui 7 by xiaomi.eu
5.10.8 | Sviluppatore

How can i upgrade to MIUI 8 and which file i have to download?

Is it "cancro" ?

Can i upgrade via "updater" app on the phone, after i have copied the file in the rom?

Thanks to everyone