ZTE ZXHN F6640 , the "exclusive" or default admin credentials vary by ISP, though standard ZTE defaults often apply. You can typically find your specific credentials on a physical sticker on the back or bottom of the router Standard Admin Credentials

Many newer ZTE units have a unique, factory-set admin password printed on the sticker located on the bottom or back of the device. MAC Address/SN: In certain regions, the admin password is the last 8 characters of the MAC address (often in ALL CAPS) or the device's Serial Number (SN) Provider Specifics: VTR (Chile): Known to use Accessing the Interface Connection:

1. The Standard Admin Account

• Username: admin
• Password: admin (Rarely works on ISP units, but try it first)

How to Reset to Factory Settings:

The default admin password for ZTE F660 or F6640 devices can vary depending on your location and the Internet Service Provider (ISP) you are using. However, many users and documentation suggest common defaults:

ZTE F660 and F6640 Admin Password: Exclusive Review and Guide

Note: Resetting may erase your internet configuration settings, requiring you to re-input your ISP data.

You only need the user-level password (often printed on the sticker) to access the settings.

Resetting the ZTE Modem to Factory Settings

If you've forgotten the admin password, you can reset the device to its factory settings: