Many V9.0 units use multipro for both username and password.
Understanding ZTE F670L V9.0 Firmware: Features, Configuration, and Support The ZTE ZXHN F670L V9.0 Zte F670l V9-0 Firmware
Contains two firmware images; if a software download or upgrade fails, the device can switch to the other image to ensure uninterrupted service. Many V9
Ensures future-proof network compatibility and smooth evolution. Zte F670l V9-0 Firmware
Always check the sticker on the back of the device for unique login credentials. Firmware Upgrades and ISP Restrictions