Okay. So I have an AT&T SGH - I377 running 4.2.2. I rooted this phone about two years ago, and I haven't touched it since. Back then, I'm pretty sure that I couldn't flash any ROMs due to a locked bootloader, but apparently, I can now? I just want a pure Google/Nexus ROM, but all the threads on how to go about flashing a ROM are confusing as hell since I haven't touched my S4 in two years.