ZKTeco K40 Pro Firmware: Top Download and Update Guide The is one of the most reliable biometric time attendance and simple access control terminals available today . Keeping your device's firmware up to date is essential for maintaining system security, improving fingerprint recognition speed, and ensuring compatibility with the latest management software like BioTime 8.0 or ZKTime.net 3.0 . K40 Time Attendance Device - ZKTeco East Africa