G950U and G955U Always with issues TMB

Checking Login and Password... OK
Ballance: 20 crd.
You have 20 credit(s) left. This operation takes 10 credits.Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-G955U
Android version: 7.0
Product code: SM-G955UZVATMB
Phone version: G955USQS2BQL1
PDA version: G955USQS2BQL1
CSC version: G955UOYN2BQL1
CSC country code: USA
CSC sales code: TMB
HW version: REV1.0
Phone SN: R28J40FS54Z
Chip name: MSM8998
Modem board: MSM8998
Security patch: 2017-12-01
RF cal date: 2017.04.06
IMEI: 35775
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
Rebooting to upload... OK
Searching Ramdump interface... COM8 detected
Reading data from phone... error (0.0)

Done with Samsung Tool PRO v.30.8

with the tmobile server unlock the only phone im able to unlock is the note8

S8 and S8+ im never able to unlock, why Mr.Blang

i even tried removing the USB cable and waiting till 48% to plug it in