N920T 5.1.1 OKC IMEI Repair Issue Pointers?…

So I Am Having A problem Writting the IMEI on this N920T 5.1.1 OKC Gives me "Exploit Failed" Error Message Every Time?… Anyone Have any Clue Or had Success before with Octoplus and N920T?..

Platform: Samsung Android
Selected port: COM35
Selected model: SM-N920T
Selected file: C:\Users\Carlos\Desktop\Phone Stuff\Phone Stuff\CERT Files\Samsung Galaxy Note 5\SM-N920T_RF8G71WDHWZ_353757070187859_8-10-2015_12-53-30.cert
Detected phone model: SM-N920T
Firmware compiled date: Fri Dec 4 17:27:12 KST 2015
PDA version: N920TUVS2COKC
CSC version: N920TTMB2COKC
SW version: N920TUVS2COKC
Phone SN: RF8G7260WFJ
Android version: 5.1.1 (LMY47X)
Checking Root:
Phone is Rooted.
Reading security backup, please wait…
Backup saved as C:\Program Files (x86)\Octoplus\Octoplus_Samsung\BACKUP\Security-SM-N920T-Unknown11-02-2016_17-30-34-.asec file
Checking Certificate file…
Certificate file successfully checked
Deactivating MSL…
Executing exploit…
Executing exploit failed
Writing Certificate failed