Depending on your specific firmware version, there are two primary ways to secure the telnet service. 1. Changing the Password via Shell
Answer & question – Official website of ZKTeco | Biometric security systems
In newer or specific firmware versions (such as those found on SafeScan or ZKTeco F18 devices), the Telnet password may be hardcoded or stored in the configuration file ZKConfig.cfg as: z1k2t3e4c5h Web Interface and Admin Passwords
In recent firmware updates, the default Telnet password for the ZMM220 has been changed to enhance device security. This update is part of an ongoing effort to strengthen the security features of the device and protect against potential threats. The new default Telnet password is more complex and robust, making it harder for unauthorized users to gain access to the device.