Most ZKTeco terminals use a hidden "Super Admin" login that is calculated based on the device's system time.
This is set within the management software (like ZKAccess 3.5 or ZKBioSecurity) to prevent unauthorized PC-to-device communication. zkteco password reset tool
The device will prompt for a password. You must enter a 6-digit code that corresponds to the time shown on the device screen. Most ZKTeco terminals use a hidden "Super Admin"
On many outdoor readers, removing the device from the wall triggers a tamper alarm. In some configurations, pressing the tamper switch three times within 30 seconds of powering on the device will reset the communication password to "0". zkteco password reset tool