SM-G550T Unlocked Done 100% with Downgrade to old Security..
1. Flash this File G550TUVS2APL1 with odine...
or Download it From Here! "Thanks to Jamil Mobile For Firmware :)
2. Root it With twrp-3.1.1-0
install Supersu zip with TWRP.
3. Read info with Octoplus and Hit on...