IOGear GCS1644 v1 - Manual (Page 33)

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Step 4
Perform the firmware upgrade again.
Step 5
When the firmware upgrade is completed, unplug
the DC connector from the KVM. Then remove
the jumper from J40 (for GCS1642) / J45 (for
GCS1644) and put the housing back together.
Final Step
Plug DC connector back into the KVM, then the
KVM will be ready for usage again.