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My brother bought a redmi 4 prime in Dec 2016. He's still on xiaomi.eu 6.12.29 What is the easiest option to update this device? Stay on xiaomi.eu or switch to official Rom? If we keep xiaomi.eu which new version is the right one and can we update straight from this very old one or do we have...

Can I just flash the new miui 9 weekly on my stable 8.5? Or do I need to wipe data? Thanks