Samsung phones, especially those on AT&T and Verizon, are notorious for being bloated affairs with tightly-locked bootloaders, and the development community has long found it unusually difficult to “liberate” these devices to give users complete control. Nevertheless, developers occasionally score significant victories over such devices, as did the legendary XDA Senior Recognized Developer beaups when he found a way to unlock the bootloader on the retail version of the Galaxy Note 4 on Verizon. The wait has been a long one, about 18 months since the phablet’s release, but now you can do all the things that Developer Edition users have long enjoyed, such as flashing TWRP Recovery and running custom ROMs.
The instructions are rather intricate, so you’ll want to follow them carefully. You’ll need an extra MicroSD card, one that you don’t have critical information stored in, as it will be formatted in the process of unlocking your bootloader. You’ll also need to know how to use ADB commands and you’ll need to have at least temporary root access. You can follow the detailed guide here. Put into perhaps oversimplified terms, the method makes your Galaxy Note 4 think it’s the Developer Edition rather than the retail version, thus allowing the bootloader to be unlocked. Unfortunately beaups’s exploit doesn’t work on the AT&T variant, nor does it work on any other Samsung devices.