open Unlocktool
select vivo
select Y81 1808 model
select meta
select safe format(keep data)
turn on the phone in normal mode
connect usb cable
power off the phone
wait until finish auto wipe data
https%3A//i.imgur.com/ufrSiL9.png[/img]']https%3A//i.imgur.com/ufrSiL9.png[/img]']https%3A//i.imgur.com/biATg0N.jpg[/img]']
https%3A//i.imgur.com/jgQLO6T.jpg[/img]']
