I have a Galaxy S5/AT&T G990A that I want to unlock the bootloader. I've been through countless web articles and forums and am still baffled. Some say you can unlock it, others say you can't. I've read so much contradictory and conflicting information I can't begin to discern what is right and what is BS. I need someone knowledgeable on this particular phone. So, here it is: Need to unlock bootloader so I can "root". Is it possible on this model and, if so, how?