open umt qfire 3.9
click Read & Tools
Brand - select Xiaomi
Model - select Redmi 3S
click Format FS
connect testpoint using tweezer then connect phone to pc - auto detect
wait until operation finished.
redmi 3s testpoint - just google
https://i.postimg.cc/63xDqSrP/redmi-3s-factory-reset.png
click Read & Tools
Brand - select Xiaomi
Model - select Redmi 3S
click Format FS
connect testpoint using tweezer then connect phone to pc - auto detect
wait until operation finished.
redmi 3s testpoint - just google
https://i.postimg.cc/63xDqSrP/redmi-3s-factory-reset.png