patch certificate g935f done but imei status NG

Patch certificate started
Gathering phone info...
Collecting information. Be patient! Do NOT disconnect the phone!
Model: SM-G935F
Sales Code: NEE
Country Code: Nordic
Timezone: Europe/Rome
Android Version: 8.0.0 [R16NW] [SDK 26]
Build Date: Mon Jan 7 14:15:29 KST 2019
PDA Version: G935FXXS3ESA2 [january 2019, rev2]
Phone Version: G935FXXU3ERKF [november 2018, revF]
CSC Version: G935FNEE3ERKF [november 2018, revF]
Product Code: NEE
HIDSw Version: G935FXXS3ESA2/G935FNEE3ERKF/G935FXXU3ERKF/G935FXXS3ESA2
Board Platform: EXYNOS5
Modem Platform: SHANNON335
Serial Number: RF8J335NKCT
Imei: 359457076912509
Unique Number: AD0117020C27155320
Connections: AT,MTP
Battery Status: 3.77V (40%)
Network Type: GSM
SIM Status: ABSENT
Multisim Config: SS
Knox Version: v30
Warranty Bit: 1
Security Patch: 2019-01-01
Data Encryption State: unsupported
Preparing...
Checking current patchcert.
Checking modem.
Checking root.
Checking boot image. Be patient! Do NOT disconnect the phone!
Reading data...
Checking modem version.
Reading data. Be patient! Do NOT disconnect the phone!
Patching certificate...
Communicating with the server. Be patient! Do NOT disconnect the phone!
After the process, the phone can restart once during startup.
Within 20-70 seconds after the phone starts, the signal strength indicator will toggle: signal -> no signal -> signal.
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: [02.15.19 19:52:50]
WorkID: 52670480


how to solve?