everytime this mistake plesase help z3x tteam

REPAIR INSTRUCTIONS:
1. Power on the phone.
2. Enable 'USB debugging' in 'Settings'-'Developer options',
tap 7 times on 'Build number' in 'Settings'-'About phone' to enable 'Developer options'.
3. Connect the phone to PC with USB cable, install drivers if needed.
4. Select device in ADB settings.
5. Press 'Reboot to...' button and select mode to reboot (download or recovery).

Operation: Patch Certificate
Selected model: SM-A810S
Software version: 34.3

Waiting ADB device... OK
Reading phone info...
Model: SM-A810S
Android version: 7.0
PDA version: A810SKSU2BRC1
CSC version: A810SSKC2BRC1
Phone version: A810SKSU2CRG4
Product code:
CSC country code: KOREA
CSC sales code: SKC
Phone SN: R59HA00M40
IMEI: 3543*********
HW version: A810S.05
RF cal date: 20161006
Chip name: EXYNOS7420
Modem board: SHANNON333
Security patch: 2018-03-01
Boot Warranty bit: 1
SIM State: NOT_READY
Checking Super user right... true
Initialization zTool... OK
Running zTool, please wait... OK
Reading modem... error (2)

Done with Samsung Tool PRO v.34.3