IOGear GCL1816KITU - Manual (Page 52)

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Firmware Upgrade
This function allows you to have the KVM activates
the firmware upgrade mode so that you can
perform a firmware upgrade to the KVM. If you
would like to do a firmware upgrade, connect the
firmware cable between the computer and KVM,
then type Y to proceed with the firmware upgrade;
otherwise, type N to cancel. After you type Y, you will see the below screen.
The KVM is now in firmware upgrade mode.
Please see Firmware Upgrade section for details
about how to perform a firmware upgrade.