I’ve seen a lot of users struggling around the internet to find out the way to root vivo phones.
And, Yeah, There are a lot of tutorials available explaining how to unlock bootloader and root vivo phones, but , nearly all of them do not work.
So, After a bit of research, here’s what I got :-
Vivo developers modified there bootloader to used a different command for bootloader unlock/relock than the the stock android commands.
Also, On some phones like vivo y51l (Upgrade to PDF1510_2.6.7), you'll need to upgrade to the latest version available.
And That’s Why we need a modified fastboot binary to unlock bootloader of vivo.
WARNING! It’ll void your warranty.
Follow the below steps to unlock bootloader of vivo phones :-
I've compiled fastboot binary with necessary modifications which you can download from below
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