sm-g920k cert writing faild…

i get sm-g920k no imei but i can’t write cert.i try to downgrade but after downgrade baseband unknown imei null.now i update again baseband ok but imei 00000000000/1..what can i do??

here is log….
Platform: Samsung Android
Selected port: COM38
Selected model: SM-G920K
Selected file: D:\iphones\cert-sm-g920s_35853206058680
_r123456789s_0346.cert
Detected phone model: SM-G920K
Firmware compiled date: Thu Sep 1 10:05:45 KST 2016
PDA version: G920KKKU3DPH4
CSC version: G920KKTC3DPH4
SW version: unknown
Phone SN: RF1D45EJGGR
Android version: 6.0.1 (MMB29K)
Sales code: KTC
Country: KOREA
HW platform: exynos5
HW Chip: exynos7420
HW Modem: unknown
Codename: zerofltektt
Checking Root:
Phone is Rooted.
Reading security backup, please wait…
Backup saved as C:\Program Files\Octoplus\Octoplus_Samsung
\BACKUP\Security-SM-G920K-Unknown31-10-2016_12-34-33-.asec
file
Checking Certificate file…
Certificate file successfully checked
Deactivating MSL…
Executing exploit…
Executing exploit failed
Writing Certificate failed

Performed by 2.4.1 Software version.