FARGO electronic DTC400 - Manual (Page 229)

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DTC400/DTC300/DTC300M Card Printer User Guide (Rev. 1.1) 10-11
Placing the Printer in the Upgrade Mode
Step Procedure
1 Disconnect Power from the Printer.
2 Press and hold down the power and pause buttons on the Printer.
3 Reapply power to the Printer. (Note: The LCD display should now show
Upgrade Firmware.)
4 Press the Yes button on the LCD to continue.