g935f patch cert status NG problem help

Chimera Mobile Phone Utility version: 20.69.1017 @ 2019-04-01
Patch certificate started
Gathering phone info...
Collecting information. Be patient! Do NOT disconnect the phone!
Model: SM-G935F
Sales Code: WIN
Country Code: ITALY
Timezone: Europe/Rome
Android Version: 8.0.0 [R16NW] [SDK 26]
Build Date: Mon Mar 4 10:30:53 KST 2019
PDA Version: G935FXXS4ESC1 [march 2019, rev1]
Phone Version: G935FXXU4ESAE [january 2019, revE]
CSC Version: G935FWIN4ESC1 [march 2019, rev1]
Product Code: WIN
HIDSw Version: G935FXXS4ESC1/G935FWIN4ESC1/G935FXXU4ESAE/G935FXXS4ESC1
Board Platform: EXYNOS5
Modem Platform: SHANNON335
Serial Number: RF8H3xxxxx
Imei: 35410906xxxxxxx
Unique Number: 9885E641343542524D
Connections: AT,MTP
Battery Status: 3.87V (20%)
Network Type: GSM
SIM Status: ABSENT
Multisim Config: SS
Knox Version: v30
Warranty Bit: 1
Security Patch: 2019-03-01
Data Encryption State: encrypted
Preparing...
Checking current patchcert.
Checking modem.
Checking root.
Checking boot image. Be patient! Do NOT disconnect the phone!
Writing boot image.
Restarting phone.
Waiting for ADB connection. Be patient! Do NOT disconnect the phone!
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!
After the phone starts, it switches to flying mode and then returns to normal mode after 20-70 seconds.
You can check the status of the imei using: *#0011#
The patchcert can be removed by repeating the process.
If a new firmware is used, the patchcert process must be repeated.
Succeeded.
Successfully finished.
Finished at local time: [04.01.19 22:49:38]
WorkID: 56103224