This is a simple easy and quick example.... And 100 precent proofed..... You will easily upgrade your any vivo smartphone firmware .....and don't panic because... It is very safe and secure.... So I hope you will try it.... Good luck....
Go to...www.google.com
Search_Vivo firmware...
And chose your model...
![](https://s2.save4k.ru/pic/b0t5qTLgJE8/maxresdefault.jpg)