Just in case you were wondering what the heck an unlocked bootloader is, perhaps starting off on the right footing is vital. A bootloader is basically code that executes before the Android operating system starts, and it is a universal concept across just about all operating systems. Bootloaders tend to carry relevant instructions to boot the operating system kernel. Most bootloaders come locked on your Android-powered device, as the manufacturers would prefer you to remain with the Android version that ships with your device.
Hence, an unlocked bootloader on the Galaxy Note 2’s developer edition would allow you to flash custom ROMs onto it to play around with the possibilities that customized firmware offers on the Android platform. After all, it makes perfect sense to do so considering how developers are the target market for this.