Samsung Galaxy s6 Edge sm925T unlock failure

Hello, I have had success unlocking other s6 edges but occasionally I get one that fails for no apparent reason. Phone is rooted here is the error log…

Welcome to Octoplus Box Samsung software version 2.2.1
———————————————————————————–
Platform: Samsung Android
Selected port: COM17
Selected model: SM-G925T
Searching for a phone. Please wait…
Phone found.
Firmware compiled date: Mon Nov 30 10:59:44 KST 2015
PDA version: G925TUVS3DOJC
CSC version: G925TTMB3DOJC
SW version: G925TUVS3DOJC
Phone IMEI: Unknown
Phone SN: R58G60JWBRH
Android version: 5.1.1 (LMY47X)
Performed by 2.2.1 software version
———————————————————————————–
Platform: Samsung Android
Selected port: COM17
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: R58G60JWBRH
Android version: 5.1.1 (LMY47X)
Backup saved as …
file
Unlocking phone…
Deactivating MSL…
Executing exploit…
Executing exploit failed
Phone unlocking failed
Performed by 2.2.1 software version

Any help would be great!
Thank you.