G955f unlock error

Checking Login and Password... OK
Ballance: 52 crd.
You have 52 credit(s) left. This operation takes 5 credits.Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-G955F
Android version: 9
PDA version: G955FXXU5DSFB
CSC version: G955FEVR5DSF1
Phone version: G955FXXU5DSFB
Product code: SM-G955FZKAEVR
CSC country code: UK
CSC sales code: EVR
Phone SN: R58J83E5J7B
IMEI: 359123081579937
HW version: MP 0.501
RF cal date: 20170813
Chip name: EXYNOS8895
Modem board: SHANNON355
Security patch: 2019-07-01
Boot Warranty bit: 0
SIM State: NETWORK_LOCKED
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... OK
Searching server... OK
Checking server answer... modem required
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... error (1)
Could not read modem. Please flash another firmware.

Done with Samsung Tool PRO v.36.8