ZKTeco devices, particularly fingerprint standalone access control terminals and time attendance machines (such as the popular SpeedFace series, F18 , K40 , or InBio controllers), rely on an embedded Linux operating system. When an administrator sets a password for the device's menu or web interface, it is stored in the device's internal flash memory.
Best for: K-series, iClock, TA series. A simple web interface. Enter the timestamp or serial number. It returns a 4-digit code. Note: This does not work for newer TFT screen devices. zkteco keycode generator
If you are buying new hardware today, assume the keycode generator will not work. You must rely on proper password management (e.g., Bitwarden for enterprise shared logins). or InBio controllers)