The default telnet password for devices using the board (typically fingerprint and biometric scanners manufactured by ZK Technology) has historically been discovered in the device configuration. Default Password Found z1k2t3e4c5h
, though some versions may prompt for a login immediately upon connection. Access & Updates
If the default credentials no longer work, it is likely the password has been or customized. You can typically find or reset this by: Web Interface
: Downloading a backup of the device's configuration (often a or archive file). Analyzing this file (e.g., ZKConfig.cfg ) may reveal the variable containing the updated password. Network Port : While Telnet uses port 23, these devices often use for proprietary communication and SDK-based management. "Deep Feature" Context
In the context of ZK-based biometric firmware, "Deep Features" or "Deep Learning" typically refers to enhanced face recognition biometric templates
used in newer firmware versions (like the ZMM220 successors) to improve matching accuracy and spoof detection. For developers, this often involves specific SDK commands to handle high-definition biometric data. SDK commands to reset the password or more information on the face recognition ProCheckUp/SafeScan - GitHub
The default Telnet password for ZKTeco devices built on the ZMM220 platform (such as certain fingerprint readers and access control terminals) is often hardcoded as: z1k2t3e4c5h
This password is often found within the device's configuration files (typically ZKConfig.cfg) and is distinct from the standard administrator passwords used for the web interface or on-device menu. Common Default Credentials for ZMM220 Devices
While z1k2t3e4c5h is specific to the Telnet service, you may encounter these other default credentials for different access levels: Web Interface (Webserver 3.0): Username: administrator Password: 123456 On-Device Menu Admin: Password: 1234 Super/Door Passwords: Password: 8888 Alternative Telnet/Linux Logins: User: root | Password: solokey, colorkey, or swsbzkgn Security Note
Leaving these default passwords active is considered a significant security risk. Researchers have demonstrated that access via these default credentials can allow for Remote Code Execution (RCE) or unauthorized data backups. It is highly recommended to disable the Telnet service entirely or update the internal configuration to use a unique, strong password if the device allows.
For official guides on securing your specific model, you can visit the ZKTeco Official FAQ or the ZKTeco Support Center. zmm220 default telnet password updated
ZKTeco ZMM220 devices, the Telnet service is often restricted for internal development. However, multiple researchers and user guides have identified default credentials that may work depending on your firmware version. Stack Overflow Common Default Credentials for ZMM220
If your device has Telnet enabled (usually on port 23 or 10086), try these common combinations: administrator (common for Web 3.0 and newer interfaces) Advanced "Updated" Passwords
Some newer ZMM220 firmware platforms use more complex default strings found within their configuration files. A notable updated password found in ZKConfig.cfg for similar ZKTeco platforms is: z1k2t3e4c5h How to Recover or Reset a Lost Password
If the default credentials do not work, you can attempt to find your specific password or reset the admin state: Extract from Backup
: If you have access to the web interface, download a backup of the device configuration. Search for the variable within the Config.cfg Generate a Temporary Password
: For physical access lockout, you can use the current time on the device to generate a one-minute temporary unlock code (often used with the ID ) through the KeySecu Reset Tool Check Port 10086 : Some ZMM220 implementations run Telnet on port rather than the standard port Security Warning
[Research] IT admins are using weak passwords too - Outpost24
For the ZMM220 (a common hardware platform for ZKTeco biometric and access control devices), the default telnet password found in configuration backups is: Telnet Password: z1k2t3e4c5h
Root Password: Often not set or matches the administrator credentials. Common Default Credentials
Depending on the specific firmware version or the service you are trying to access, you may also encounter these common defaults: Administrator Web Interface: Username: administrator or admin Password: 123456 or 1234 The default telnet password for devices using the
Hardware Tamper Reset: If you are locked out, some models allow you to reset to the default password (1234) by pressing the Tamper Switch three times within 30 seconds of hearing a short beep after dismantling.
Door Access Code: 8888 (default door password for many units).
Data Transfer: *1514885702# (fixed for device-to-device communication). Security Warning
These devices are known to store credentials in a plain-text configuration file named ZKConfig.cfg within a tar archive that can often be downloaded via the web interface. It is highly recommended to change these default passwords and disable Telnet if it is not required for your operations, as it is an unencrypted protocol.
Are you trying to recover a lost admin password or perform a firmware update on this specific board? ProCheckUp/SafeScan - GitHub
Solution: 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).
Visit the official support portal (login required for enterprise customers) or request the firmware from your distributor. The filename is typically zmm220_fw_v2.3.1.bin.
The firmware/configuration has been updated to address this vulnerability.
Current Behavior:
Updating the default password is just the first step. To truly secure your ZMM220 deployment, follow these recommended practices: Legacy Devices: Users attempting to access legacy ZMM220
If you need access, do not search for hacked or leaked backdoor passwords. Instead, follow this professional recovery workflow:
Step 1: Identify the Current State
Step 2: The Hardware Reset Most ZMM220 devices have a physical reset button (hold for 10-30 seconds during power-on). Warning: This may reset the entire configuration to factory defaults. After a factory reset, the device will temporarily revert to its default password—but only for 5 minutes or until you set a new one.
Step 3: Use Modern Protocols If you only need to monitor or configure the device, avoid Telnet. Use SSH (port 22) if available, or the device’s SNMP interface. Telnet sends every keystroke (including your “updated” password) in plain text—anyone on your local Wi-Fi can sniff it.
Step 4: Consult the Official Documentation Search for “ZMM220 user manual revision 2.0” or later. The manufacturer’s website should have a “Security Advisory” explaining the default password policy change. Common updated default formats include:
serial number reversed (e.g., if S/N is 12345, password is 54321)last 8 characters of the MAC addressadmin + random 6-digit number from the stickerThe phrase "zmm220 default telnet password updated" will likely evolve over time. To stay current:
Do not rely on blog posts or forums for long-term credential accuracy. Always verify with the device’s documentation or sticker.
Earlier iterations of the ZMM220 firmware shipped with a default Telnet password. In many network environments, default credentials remain unchanged by end-users, creating a vulnerability that could be exploited by malicious actors for unauthorized remote access.
Previous Behavior: