samsung j530f patch error

REPAIR INSTRUCTIONS:
Phone must be rooted!
If the software can't root the phone automatically,
then you must root your device manually.
1. Power on the phone.
2. Tap 7 times on 'Build number' in 'Settings'-'About phone' to enable 'Developer options',
go to 'Settings'-'Developer options' and enable 'USB debugging'.
3. Connect the phone to PC with USB cable, install drivers if needed.
4. Select device in ADB settings.
5. Fill values what you need to repair.
6. Press 'Repair' button.
7. Press 'Patch Certificate' if you have network problem after repairing.

Operation: Patch Certificate
Selected model: SM-J530F
Software version: 37.0

Waiting ADB device... OK
Reading phone info...
Model: SM-J530F
Android version: 9
PDA version: J530FXXU5CSH7
CSC version: J530FOXA5CSH6
Phone version: J530FXXU5CSH5
Product code: SM-J530FZKDXEO
CSC country code: Poland
CSC sales code: XEO
Phone SN: RF8K1001FEA
IMEI: 355232445311673
HW version: MP 0.500
RF cal date: 20180102
Chip name: EXYNOS7870
Modem board: SHANNON315
Security patch: 2019-08-01
Boot Warranty bit: 1
SIM State: ABSENT,ABSENT
Checking Super user right... true
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
KNOX WARRANTY VOID is 0x1. Phone is not supported

Done with Samsung Tool PRO v.37.0




please any way to downgrade modem?