Z3X does not have any pass and login, maybe you tried to use server credits.
Server Credits enable you to unlock the latest Samsung & LG phones by reading the unlock codes from phone safely and quickly - without the need to root (void KNOX flag) and risk of bootloop. Just click Read Codes in the latest Z3x software.
Credits using only to read network codes on new kind of phones. At this time it's about 550 (like s8, s9, s10...) of total 2400 new models.
You can buy a new credit account or refill credits to an existing one you have. Inform your sales manager about it while ordering the item. Otherwise, the system will automatically create a new account for z3x credits.
Here is the reseller list :
GsmEasy
Country: China, Hong Kong
Web https://www.imei.us . ( Instant Avalable Z3x Unlock Credits)
Web https://www.gsmeasyshop.com
E-mail info.gsmeasy@gmail.com
Phone 8613926070786
Skype gsmeasy
WhatsUp 008613926070786
QQ 414671997
Sonork 100.1576815
GsmServer
Country: Hong Kong and WorldWide
Web https://www.gsmserver.com . (Buy Z3x Unlock Credits Online)
E-mail info.gsmserver.com
Phone: +85239733882
Skype: gsmserver.com, sonnka123456, ventasgsm.es
WhatsUp/viber:
+380671258752
+380677470832
+380730019516
Sonork: 100.85899, 100.1587356,
100.106806
SimSim Electronics LLC
location: Dubai, UAE
Phone: +971 4 2727113
ICQ: 129081860
Sonork: 100.37251
E-mail: hamsfazil @ gmail.com
Skype: hams.fazil
GsmSalman
Country: Pakistan, UAE "Dubai"
Contact person Muhammad Salman
Web http://www.gsmfastest.com
E-mail admin@gsmfastest.com
Phone +923007859995
Skype GsmSalman
WhatsUp +923007859995
Viber +923007859995
Sonork 100.1601293