vivo y21t demo mode
first step remove demo
run unlocktool latest version
select vivo
select model vivo y20t (2021)
select remove demo
put phone in fastboot mode by holding vol+ then connect usb to pc
click (fb)(qcom) remove demo
wait till operation finished
take note that demo mode is remove and bootloader unlock automatically
2nd step
to relock bootloader
select function
put phone in fastboot mode by holding vol+ then connect usb cable to pc
click (fb)(qcom)relock bootloader
wait till operation finished
first step remove demo
run unlocktool latest version
select vivo
select model vivo y20t (2021)
select remove demo
put phone in fastboot mode by holding vol+ then connect usb to pc
click (fb)(qcom) remove demo
wait till operation finished
take note that demo mode is remove and bootloader unlock automatically
2nd step
to relock bootloader
select function
put phone in fastboot mode by holding vol+ then connect usb cable to pc
click (fb)(qcom)relock bootloader
wait till operation finished