G935A 8.0.0 unlocking error

peration: Read Codes via Server
Selected model: SM-G935A
Software version: 34.8

Checking Login and Password... OK
Ballance: 10 crd.
You have 10 credit(s) left. This operation takes 5 credits.Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SAMSUNG-SM-G935A
Android version: 8.0.0
PDA version: G935AUCS8CRJ2
CSC version: G935AATT8CRJ2
Phone version: G935AUCS8CRJ2
Product code: SM-G935AZKAATT
CSC country code: USA
CSC sales code: ATT
Phone SN: R38H20NV3RZ
IMEI: 357216070826483
HW version: REV0.7
RF cal date: 2016.02.24
Chip name: MSM8996
Modem board: MSM8996
Security patch: 2018-10-01
Boot Warranty bit: 0
SIM State: ABSENT
Rebooting phone... OK
Waiting ADB device... OK
Rebooting phone... OK
Waiting ADB device... OK
Waiting for device to become ready... OK
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... OK
Searching Ramdump interface... COM25 detected
Reading data from phone... error (3 0)

Done with Samsung Tool PRO v.34.8