If Google Recovery is not helping her recall what that was, then you can search Bypass Google FRP on ZTE device. In return, those who buy refurbished or pre-owned phones can be locked out.
#Zte flash refurbished how to#
Troubleshooting Assistant - ZTE Blade™ Vantage Prepaid.
Factory reset in that case is only possible with access to your Google Account and screen lock information.