I rooted my gs4 on att (i337) (Ucuamf3) using the sd card/terminal emulator exploit. It worked just fine, and have full root access. I then proceeded to install safestrap to get some custom roms going. Safestrap installed and I booted to recovery just fine. Then I flashed a few safestrap-compatible roms, none of which worked. they all booted to a consistent black screen. Thrn, I looked for a more up-to-date safestrap version, which I did. So I installed it, and now I cant boot into safestrap at all. Like literally, it just skips over it. And it says its installed...please, please help.