SM-G925S imei repair filed

Hello team! I have been galaxy g925s korean after downgarde firemware 6.0.1 to 5.1.1 imei unknown… I do repair secruity wipe secruity and repair efs than write cert file Security is damaged
I tried…any boxses the sim problem please help me team support.
[SPOILER="Info"]Platform: Samsung Android
Selected port: COM1
Selected model: SM-G925S
Selected file: D:\SM-G925S_358534060231103_0346.cert
Detected phone model: SM-G925S
Firmware compiled date: Fri Nov 27 17:36:31 KST 2015
PDA version: G925SKSU3COK5
CSC version: G925SRKC3COK5
SW version: Unknown
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-G925S-Unknown19-05-2016_14-16-42-.asec file
Checking Certificate file…
Certificate file successfully checked
Deactivating MSL…
Executing exploit…
Exploit has been executed successfully
Security is damaged
Writing Certificate failed
Performed by 2.2.2 software version[/SPOILER]