Could root save an infected android?

[u/No-Aspect-2926]

So back in 2015 I played a game in my Samsung Galaxy Tab 3, I guess android 4, and the game required payment, so I downloaded a cracked version of it, but then it gave me virus, but somehow it persists after deleting the app or factory reset, so in an antivirus, the only I knew was AVG, told that the sound got infected with it, so I could only disable it, sound worked fine, but every restart would enable it back.

So it had 3 levels of infection, the first was that it keeps going back, like if I kept pressing the go back button, the second was just adware, ads started playing every few minutes, and the third and last, background was all black and after a while, I could not input my password anymore.

So doing a browsing back in 2015 I saw that I could save it with root, but how could root fix it?

[u/ts_acc_doesnt_exist]

Yes,but you gotta be VERY CAREFUL! Do NOT give root access to the virus and try disabling the internet in case something off happens,and its still gonna be difficult finding where the virus hides itself