SM-G920T can’t unlock with newer update

hello, i have problems with the new update of octoplus samsung:

Platform: Samsung Android
Selected port: COM23
Selected model: SM-G920T
Detected phone model: SM-G920T
Firmware compiled date: Mon Nov 30 10:58:17 KST 2015
PDA version: G920TUVS3DOJC
CSC version: G920TTMB3DOJC
SW version: G920TUVS3DOJC
Phone SN: R58G50XNK4X
Android version: 5.1.1 (LMY47X)
Backup saved as C:\Program Files (x86)\Octoplus\Octoplus_Samsung\BACKUP\Security-SM-G920T-Unknown04-03-2016_15-18-25-.asec file
Unlocking phone…
Deactivating MSL…
Executing exploit…
Executing exploit failed
Phone unlocking failed
Performed by 2.2.1 software version

any help or suggest please?