Just so you guys know, this has nothing to do with Verizon "blacklisting" older builds....that is not a thing. What has happened is that Verizon and ATT has put locked bootloaders and once YOU accept the 4.3 or above update in any stock form it will install install KNOX. Knox is a warranty thing and for some people doesn't matter...the locked bootloader wont allow kernels to be changed so custom roms other than stock based are out of the question IF at all possible via a safestrap recovery. You all should be careful and not try random root methods and just because someone says it worked on their phone. The Tmobile phone is not the same as the verizon, sprint, etc