What Does Unlocking the Bootloader Do?
Unlocking the bootloader changes which operating-system software an Android phone can accept and start.

Before installing a custom ROM, verify the exact hardware model, carrier or region variant, codename, current firmware, bootloader-unlock support, and ROM…
Customize Android without root by changing one layer at a time: wallpaper and system color, home-screen grid and folders, default launcher, widgets,…
ROM DecisionsUnlock your bootloader only when a supported custom image or development task solves a specific problem and you accept the factory reset, boot warning,…
Unlocking the bootloader changes which operating-system software an Android phone can accept and start.