After write ur modem
Waiting ADB device ... OK
Reading phone info ...
Model: SM-J400F
Android version: 9
PDA version: J400FXXU4BSF4
CSC version: J400FOJM4BSF1
Phone version: J400FXXU4BSF1
Product code: SM-J400FZKGPAK
CSC country code: PAKISTAN
CSC sales code: PAK
Phone SN: RV8K70QHH1L
IMEI: 358412090263927
HW version: MP 0.300
RF cal date: 20180720
Chip name: EXYNOS7570
Modem board: SHANNON305
Security patch: 2019-07-01
Boot Warranty bit: 0
SIM State: ABSENT, ABSENT
Initialization zTool ... OK
Running zTool, please wait ... OK
Reading data from phone ... OK
Searching server ... OK
Checking server answer ... modem not supported
Searching server ... OK
Checking available files ... not found compatible file
Try downgrade modem if possible
Done with Samsung Tool PRO v.38.2