Contact ZMM220 support with the device’s serial number and proof of purchase. They can regenerate the unique default password from their factory database (may take 24-48 hours).
Securing the Telnet password permanently requires updating the device core software. zmm220 default telnet password updated
If you are attempting to login and are receiving "Login incorrect" or "Authentication failed," it is because the default password has been updated in new firmware patches, or it is no longer blank. Common Credentials to Try (Post-Update) While the default login is almost always: Username: root Contact ZMM220 support with the device’s serial number
What or specific device model (e.g., ZKTeco, Granding, etc.) is using this ZMM220 board? If you are attempting to login and are
[ Unsecure Network Traffic ] │ ▼ ┌──────────────────────────────────────┐ │ Corporate Firewall / VLAN │ └──────────────────┬───────────────────┘ │ (Block Port 23) ▼ ┌──────────────────────────────────────┐ │ ZMM220 Biometric Terminal │ │ ┌────────────────────────────────┐ │ │ │ Disable Telnet Daemon │ │ │ ├────────────────────────────────┤ │ │ │ Enforce Complex Root Passwd │ │ │ └────────────────────────────────┘ │ └──────────────────────────────────────┘ Disable the Telnet Daemon
If you must keep Telnet or SSH enabled for custom software integrations, change the default password immediately upon logging in: Log into the device terminal as root . Type the command: passwd Enter your new, complex password and confirm it. Best Practices for Biometric Device Network Security