n900p red x no signal fix
got it fixed, even though supersu disabled knox, there was still a security issue. I used titanium backup and searched for knox. then I disabled everything that had to do with knox, instantantly t-mobile pop up.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?