You navigate to the firmware download section and enter the model number "K40 Pro" in the search bar. After a few seconds, the website displays a list of available firmware versions for your device. You find the latest version, which is labeled as "V3.2.2" (or similar).
You're looking for the updated firmware for the ZKTeco K40 Pro! zkteco k40 pro firmware download updated
Here's a helpful story: