You need to remove the bootloader if you want to flash the machine, flash online to save bricks, and obtain root permissions.
We call this operation of lifting restrictions called unlocking BL, and only after unlocking BL, can you perform a series of operations such as flashing the machine and rooting permissions.
We call this operation of lifting restrictions called unlocking BL, and only after unlocking BL, can you perform a series of operations such as flashing the machine and rooting permissions.