Deleting virus system app

Hi. I bought 2 Xiaomi mi 4c's. They both have virus. Ads are everywhere, even i can't use the phone many times. I tried factory settings, but the rom has virus in it.
I tired bootloader, and deleted the apps that Kaspersky says has virus. But even though i deleted them, they came back, and phone is installing apps automatically. And it gets too hot even when i'm not using.

How can i clear those apps without new Android?
Notu app has virus.

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