Download the firmware upgrade file from the printer's product page found at http://www.customamerica.com
(You will need to register for the Custom America website if you have not already)
*If the printer is a My3 or MyPrinter, you will need to enter USB mode through the printer setup (Hold LF while powering on the device, then change "Interface" to USB or USB/RS232)
Instructions to upgrade firmware:
If you are asked by UpgCePrn to update the bootloader, download also the bootloader file from the printer product page
Instructions to upgrade bootloader: