How to definitely remove the Trojan from Android?

Question

Android

The question is somewhat different from the one written in the title and may seem vague, but I could not formulate it differently. Let's say the phone is infected. It flashes through tvrp with the full format of the date, cache and everything else ... but after all, the imei and serials remain untouched, can the virus survive somewhere in that area?
And how can you make sure that the internal drive is clean, if antiviruses check only what is being formatted ...

Answer 1

In imei, a virus cannot exist.
But in Tvrp, it can easily be a virus.
Sometimes even in Chinese phones in the firmware itself, the virus

Answer 2

Flash with a flash drive, marking all sections of the original firmware downloaded from the manufacturer's website.

Answer 3

Antivirus detects the presence of router rights on the android, but why then is it impossible to remove a number of initially running applications with the phone? Lenovo7600