n916k write cert failed

Welcome to Octoplus/Octopus Box Samsung software version 2.4.0
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Platform: Samsung Android
Selected port: COM13
Selected model: SM-N916K
Searching for a phone. Please wait…
Phone found.
Detected phone model: SM-N916K
Firmware compiled date: Tue Apr 12 13:32:17 KST 2016
PDA version: N916KKTU2DPD6
CSC version: N916KKTC2DPD6
SW version: N916KKTU1BOB2
Phone SN: R39G50EL4F
Android version: 6.0.1 (MMB29K)
Sales code: KTC
Country: KOREA
HW platform: exynos5
HW Chip: exynos5433
HW Modem: SHANNON333
Codename: tre3caltektt
Performed by 2.4.0 Software version.
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Platform: Samsung Android
Selected port: COM13
Selected model: SM-N916K
Selected file: C:\Program Files\Octoplus\Octoplus_Samsung\BACKUP
\SM-N916S_35688506139241_R58P123456P_0800.cert
Detected phone model: SM-N916K
Firmware compiled date: Tue Apr 12 13:32:17 KST 2016
PDA version: N916KKTU2DPD6
CSC version: N916KKTC2DPD6
SW version: N916KKTU1BOB2
Phone SN: R39G50EL4F
Android version: 6.0.1 (MMB29K)
Sales code: KTC
Country: KOREA
HW platform: exynos5
HW Chip: exynos5433
HW Modem: SHANNON333
Codename: tre3caltektt
Checking Root:
Phone is Rooted.
Reading security backup, please wait…
Phone will restart now. Please don’t disconnect cable!
Perform the following steps:
1. Connect phone via UART cable to the Box.
2. Note: phone screen must be active
Connecting to phone, please wait…
Writing Certificate failed
Performed by 2.4.0 Software version.