Phone unlocking failed


——————————————-
Platform: Samsung Android
Selected port: COM1
Selected model: SM-G925T
Detected phone model: SM-G925T
Firmware compiled date: Mon Nov 30 10:59:44 KST 2015
PDA version: G925TUVS3DOJC
CSC version: G925TTMB3DOJC
SW version: G925TUVS3DOJC
Phone SN: R58G70PC5TK
Android version: 5.1.1 (LMY47X)
Backup saved as C:\Program Files\Octoplus\Octoplus_Samsung
\BACKUP\Security-SM-G925T-Unknown27-02-2016_07-32-46-.asec
file
Unlocking phone…
Deactivating MSL…
Executing exploit…
Executing exploit failed
Phone unlocking failed
Performed by 2.2.1 software version

why?