But they give an oem unlock option to unlock the bootloader isnt that fishyVivo states on their website that they do not want you to root their devices as it is unsafe for your phone's security + there is no way to root vivo mtk devices as of now
The problem is that there is no official way to unlock Vivo phones though there is a method in which you patch the boot.img with magisk and flash it via sp flash tool which will root the device but I never found a rom compatible with sp flash tool for my vivo y91c. So my conclusion is don't play with your device and if you really want to play with your device then exchange your vivo phone with a Xiaomi phone or any other brand which allows you to unlock the bootloader.But they give an oem unlock option to unlock the bootloader isnt that fishy
Not possible unfortunately