g928t unlock failed

Platform: Samsung Android
Selected port: COM1
Selected model: SM-G928T
Detected phone model: SM-G928T
Firmware compiled date: Fri Dec 4 17:37:11 KST 2015
PDA version: G928TUVS2COKC
CSC version: G928TTMB2COKC
SW version: G928TUVS2COKC
Phone SN: R58GC1T7QHD
Android version: 5.1.1 (LMY47X)
Checking Root:
Phone is Rooted.
Reading security backup, please wait…
Backup saved as C:\Program Files\Octoplus\Octoplus_Samsung
\BACKUP\Security-SM-G928T-Unknown03-03-2016_02-03-09-.asec
file
Deactivating MSL…
Executing exploit…
Executing exploit failed
Phone unlocking failed
Performed by 2.2.1 software version