Because I had to do root it, and I left the bootloader unlock.
That's why I wanted to lock it without having to erase it, just for security reasons.
I'm gonna read few times what you've post.
I promise that it will be worth it, coz not now but in few days reading and so on I'll be able to understand everything.
But as everything it takes time.
Sent from my Nexus 5 using Tapatalk