sm-n910s cert file write problem.

i need write cert file but failed is any possible help???
i was downgrade modem file also but same log is bellow

Quote:

Welcome to Octoplus Box Samsung software version 2.6.6 ----------------------------------------------------------------------------------- To connect SM-N910S 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. ----------------------------------------------------------------------------------- Platform: Samsung Android Selected port: COM4 Selected model: SM-N910S Operation: Write Cert Selected file: C:\Users\hp\Desktop\SM-N910S cert file 1\SM-N910S_ 354678060615684_0516.cert Detected phone model: SM-N910S Firmware compiled date: Thu Oct 26 16:16:59 KST 2017 PDA version: N910SKSU2DQJ2 CSC version: N910SSKC2DQJ2 SW version: N910SKSU0COL1 Android version: 6.0.1 (MMB29K) Sales code: SKC Country: KOREA HW platform: exynos5 HW Chip: exynos5433 HW Modem: SS303 Security patch level: 2017-08-01 SIM 1 status: not ready Codename: trelteskt 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... Found phone on COM4 Phone connected successfully Checking Certificate file... Certificate file successfully checked Writing new phone IMEI... Writing Certificate failed Performed by 2.6.6 Software version.