It's FRP, Factory Reset Protection.

HERES LINK WITH SYSTEM.IMG and BOOT.IMG

System entered a bootloop after using cfroot.

Okay guys so many people called me fake and I don't blame you..having 5.1.1 even when nexus devices don't have it is kinda suspicious but I need to clarify some things.. New boot loader is not locked like Verizon/ATT phonesThis is google's response to Icloud for stolen/lost devices.. I tried to flash twrp and cfroot and freaked out when i got the error about bootloader being locked...Now this doesn't mean Samsung/Tmobile will completely lock bootloaders in the future but we have to wait and see... phone seems to be really smooth and stable , however it looks like the camera needs some work done so I'm 100% this is not the final build and I guess I'm just lucky I got it this morning and be happy that Samsung has a build this stable with 5.1.1 which means official releases are not far.New Bootloader now has Factory Reset Protection aka Google "Icloud Lock"wont let you flash custom binaries anymore!and a video for the non believers... https://www.youtube.com/watch?v=Qehl...ature=youtu.be