This is the most secure method for terminals not connected to a network. Prepare Drive : Format a USB flash drive to FAT32. Add Firmware : Copy the firmware upgrade pack (containing ) to the root directory of the USB drive. Terminal Update

A safe update checklist

Always download firmware from official ZKTeco regional portals to ensure the software is authentic and compatible with your specific hardware version.

If the power went out now, or if the file he downloaded was for the wrong hardware revision, the screen would stay black forever. The device rebooted.

A progress bar appeared on his screen and simultaneously on the F18’s display.