j600fn unable to patch cert

Gathering phone info...
Collecting information. Be patient! Do NOT disconnect the phone!
Model: SM-J600FN
Sales Code: PHE
Country Code: SPAIN
Timezone: Europe/Rome
Android Version: 8.0.0 [R16NW] [SDK 26]
Build Date: Fri Aug 3 18:48:36 KST 2018
PDA Version: J600FNXXU3ARH1 [august 2018, rev1]
Phone Version: J600FXXU3ARH1 [august 2018, rev1]
CSC Version: J600FNOXM3ARH1 [august 2018, rev1]
Product Code: PHE
HIDSw Version: J600FNXXU3ARH1/J600FNOXM3ARH1/J600FXXU3ARH1/J600FNXXU3ARH1
Board Platform: EXYNOS5
Modem Platform: SHANNON315
Serial Number: R58KA6LE1WK
Imei: 35706209xxxxxxx
Unique Number: CBJ0000F64F8F95
Connections: AT,MTP
Battery Status: 3.85V (36%)
Network Type: GSM
SIM Status: ABSENT
Multisim Config: SS
Knox Version: v30
Warranty Bit: 0
Security Patch: 2018-08-01
Data Encryption State: unencrypted
Preparing...
Checking current patchcert.
Checking modem.
Checking root.
Checking boot image. Be patient! Do NOT disconnect the phone!
Selinux could cause problems.
If the patchcert does not work, try another root solution.
Reading data...
Checking modem version.
Restarting phone.
Waiting for ADB connection. Be patient! Do NOT disconnect the phone!
Reading data. Be patient! Do NOT disconnect the phone!
Patching certificate...
Communicating with the server. Be patient! Do NOT disconnect the phone!
Unable to patch certificate.
Finished at local time: [02.14.19 15:07:13]
WorkID: 52556341

phone rooted, imei repaired and patch gives error

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ss