g928f baseband unknown propper solution??

BACKUP 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. Press 'Read EFS' button to read backup or 'Write EFS' to restore.
6. Press 'Write CERT' to restore certificates.
7. Press 'Write NV DATA' if you need to restore NV backup.

Read certificate operation:
1. Power on the phone.
2. Connect the phone to PC with USB cable.
3. Check Samsung modem in device manager, install drivers if needed.
4. Press 'Read CERT' button to read certificates.

Read certificate via diagnostic port:
1. Power on the phone.
2. Type *#0808# and select 'DM+MODEM+ADB'.
3. Connect the phone to PC with USB cable, install drivers if needed.
4. Press 'Read CERT DIAG' button to read certificates.

Operation: Write CERT
Selected model: SM-G928F
Software version: 31.5

Waiting ADB device... OK
Reading phone info...
Model: SM-G928F
Android version: 6.0.1
PDA version: G928FXXS3BPIA
CSC version: G928FTMZ3BPI1
Phone version:
Product code:
CSC country code: CZECH
CSC sales code: TMZ
Phone SN: R58G725F15Y
IMEI:
HW version:
RF cal date:
Chip name: EXYNOS7420
Modem board:
Security patch: 2016-09-01
Boot Warranty bit: 1
Checking Super user right... true
Reading NV data... OK
Checking NV data... OK
Initialization zTool... OK
Running zTool, please wait...
Start... OK
Initialization... OK
Generate and check client proof... OK
Verify proof by client... OK
Reading data from phone... error (0)
Reading data... OK
Detecting MODEM... OK
Reading MODEM... OK
Calculating... error (0 6)

Done with Samsung Tool PRO v.31.5