Never flash firmware meant for F602W V2 if you have V1.
Try admin / admin or the credentials printed on the router's bottom label. 2. Locate the Upgrade Tool zte f602w firmware better better
Firmware is the software that controls the ZTE F602W router's hardware components, dictating how they interact and function. The firmware acts as a bridge between the router's hardware and the user interface, enabling features like Wi-Fi connectivity, firewall protection, and Quality of Service (QoS) settings. The ZTE F602W comes with pre-installed firmware, but users can upgrade to newer versions or custom firmware to improve performance, fix issues, or add new features. Never flash firmware meant for F602W V2 if you have V1