samsung g950u sprint unlock

hi, hope someone can help me with my s8 sprint bql1. this is the error when unlocking with z3x box.
Operation: Unlock
Selected model: SM-G930P
Software version: 30.9

Waiting ADB device... OK
Reading phone info...
Model: SM-G950U
Android version: 7.0
Product code: SM-G950UZKAXAS
Phone version: G950USQS2BQL1
PDA version: G950USQS2BQL1
CSC version: G950UOYN2BQL1
CSC country code: USA
CSC sales code: XAS
HW version: REV1.0
Phone SN:
Modem board: MSM8998
Security patch: 2017-12-01
RF cal date: 2017.07.05
IMEI: 355
Writing AT RIL... OK
Initialization AT RIL... OK
Unlocking... error

Done with Samsung Tool PRO v.30.9