From Maintenance Port - Sony GY-8240UWD Maintenance Manual

5-5. UPDATE Mode

5-5-4. From Maintenance Port

Function: Transfers data from the maintenance port to update the firmware.
Operation: Enter "1"".
When updating is started, a message to confirm the updated state of the unit "Firmware update ready..."
will be displayed. If the result displayed is "OK", a message requesting the transmission for the CPU
firmware data "Sending Firmware Data" will be displayed. Send the data from this port.
After sending the data, updating starts.
If the result is "NG", it means that the unit cannot be updated, and the UPDATE prompt will be displayed
again.
UPDATE=> 1"
<< Firmware update from maintenance port >>
Firmware update ready.... OK
Sending firmware data...........Done.
Programing Start...
UPDATE=> 1"
<< Firmware update from maintenance port >>
Firmware update ready.... NG
UPDATE=>
5-58
From Maintenance Port Execution Screen
When the Unit Cannot Update
GY-8240UWD
GY-8240FC