The is a beast of a machine (Quad-core CPU, 4x4 MIMO). It is a shame to use it as a simple WiFi AP. By using the exclusive credentials—primarily root / Zte521 —you unlock its potential to become a pro-sumer networking tool.
is a robust piece of networking hardware. However, its best features are hidden behind the admin login. Always check your device sticker zte f6640 admin password exclusive