IOGear GCS1808KITU - Manual (Page 61)

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Step 3
Now plug the DC connector back into the DC
jack from the KVM. This will restore the KVM with
factory default firmware.
Step 4
A message will appear on the monitor as below.
Step 5
Unplug DC connector from the KVM, then remove
the jumper and screw the housing back on the
KVM.
Final Step
Plug DC connector back into the KVM, then the
KVM will be ready for usage again.