Eto po kasi yan, hindi po lahat ng phones ay nakaunlock na yung bootloader, if you're wondering what is a bootloader, ang bootloader ay yung nag allow sayo na mag root via applications. Some people are still expecting for One Click Root/Kingo Root/Baidu Root/Z4 Root to root their phones. May mga phones din naman na unlocked na kaagad yung bootloader, so, "pwedeng" maging unlocked na ang mga Oppo phones. Just try and test it, wala namang mawawala. Pero, pag ayaw, well you'll need to flash it via ODIN/Recovery Mode.