how to fix IMEI Status:NG G935f

Waiting ADB device... OK
Reading phone info...
Model: SM-G935F
Android version: 8.0.0
PDA version: G935FXXS3ERHD
CSC version: G935FOXA3ERGE
Phone version: G935FXXU3ERHC
Product code:
CSC country code: UK & IRE
CSC sales code: BTU
Phone SN: RF8H31RC88Y
IMEI: 357330073961781
HW version:
RF cal date:
Chip name: EXYNOS8890
Modem board: SHANNON335
Security patch: 2018-09-01
Boot Warranty bit: 0
SIM State: ABSENT
Checking Super user right... true
Reading NV data... OK
Checking NV data... OK
Reading data... OK
Detecting MODEM... OK
Reading MODEM... OK
Calculating... OK
Writing zTool... OK
Initialization zTool... OK
Rebooting phone... OK
Patching CERT check... done
Done with Samsung Tool PRO v.34.6

IMEI Status:NG