Which (if any) are you using to manage it centrally? Are you currently locked out of the web panel?
If you tried admin/12345 and were rejected, one of three things has happened:
To access the Web 3.0 interface, your PC and the ZKTeco device must be on the same local network. zkteco web 3.0 default username and password
Most ZKTeco devices utilizing the Web 3.0 internet platform share a standardized set of factory credentials. Factory Default Access admin Default Password: admin or 123456 Alternative Default Combinations
Help you find the specific for a particular ZKTeco model. Which (if any) are you using to manage it centrally
Here is what an attacker can do with default credentials:
Select or modify an existing user to assign them the Super Admin role. Most ZKTeco devices utilizing the Web 3
Some firmware versions have a hidden backdoor for resellers. Try:
Some high-end controllers have a secondary "Super Admin" role for absolute system settings. The default for this is usually: