SM-G935F problem with write cert [Answered]

Hi
I have problem with write cert G935F
Modem is downgraded (file from support)
Securty wrote ok, but cert always failed on 3 computers


Welcome to Octoplus Box Samsung software version 2.6.9
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To connect SM-G935F phone you have to perform the following steps:
1. Disconnect USB cable from phone.
2. Go to Menu->Settings->More->About Device.
3.Tap on "Build number" 7 times to enable developer options.
4. Go to Menu->Settings->More->Developer options.
5. Turn on "USB Debugging" option.
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Platform: Samsung Android
Selected port:
Selected model: SM-G935F
Operation: Write security
Detected phone model: SM-G935F
Firmware compiled date: Tue Apr 17 09:49:24 KST 2018
PDA version: G935FXXS2DRDI
CSC version: G935FXEO2DRB6
SW version: unknown
Phone SN: R58H720895A
Android version: 7.0 (NRD90M)
Sales code: XEO
Country: Poland
HW platform: exynos5
HW Chip: exynos8890
HW Modem: unknown
Security patch level: 2018-04-01
SIM 1 status: not ready
Codename: hero2ltexx
Checking Root:
Phone is Rooted.
Writing security backup, please wait...
Phone will restart now. Please don't disconnect cable!
Security write successfully.
Performed by 2.6.9 Software version.
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Platform: Samsung Android
Selected port:
Selected model: SM-G935F
Operation: Write Cert
Selected file: G:\Szwajcar\Cert-SM-G935F-R58H720895A-
3573300728xxxxx\Cert-SM-G935F-R58H720895A-
3573300728xxxx.cert
Detected phone model: SM-G935F
Firmware compiled date: Tue Apr 17 09:49:24 KST 2018
PDA version: G935FXXS2DRDI
CSC version: G935FXEO2DRB6
SW version: unknown
Phone SN: R58H720895A
Android version: 7.0 (NRD90M)
Sales code: XEO
Country: Poland
HW platform: exynos5
HW Chip: exynos8890
HW Modem: unknown
Security patch level: 2018-04-01
SIM 1 status: not ready
Codename: hero2ltexx
Checking Root:
Phone is Rooted.
Reading security backup, please wait...
Backup saved as C:\Program Files (x86)\Octoplus\Octoplus_Samsung
\BACKUP\Security-SM-G935F-R58H720895A-22-06-2018_07-34-
42-.asec file
Connecting to modem port...
Modem port was not found!
Initializing exploit...
Executing exploit...
Executing exploit failed
Writing Certificate failed
Performed by 2.6.9 Software version.