G930A can't unlock server error code for 3 days

I though it was a server problem, but other server code ok, only this phone.

What is the problem?

Checking Login and Password... OK
Ballance: 5 crd.
You have 5 credit(s) left. This operation takes 5 credits.Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SAMSUNG-SM-G930A
Android version: 6.0.1
PDA version: G930AUCS4APK1
CSC version: G930AATT4APK1
Phone version: G930AUCS4APK1
Product code: SM2G930AZKAATT
CSC country code: USA
CSC sales code: ATT
Phone SN: R38J5
IMEI: 35742507
HW version: REV0.6
RF cal date: 2017.05.12
Chip name: MSM8996
Modem board: MSM8996
Security patch: 2016-11-01
Boot Warranty bit: 0
Waiting for device to become ready... 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... OK
Searching Ramdump interface... COM5 detected
Reading data from phone... OK
Calculating... OK
Searching server... OK
Waiting for server answer... error (1)

Done with Samsung Tool PRO v.32.7