1. open unlocktool click vivo tab
2. seach y1s
3. choose vivo y1s new sec patch preloader
4. choose factory reset foe password
5. choose reset frp for frp
6. turn off unit then insert usb cable
7. no boot key
8. done
2. seach y1s
3. choose vivo y1s new sec patch preloader
4. choose factory reset foe password
5. choose reset frp for frp
6. turn off unit then insert usb cable
7. no boot key
8. done