Use the USB cable to connect COWON D3 to the PC.
Select Trun on USB storage to copy files between PC and D3.
Copy and paste the firmware file to the root folder of the device.
Click "Safely Remove Hardware" icon in the tray at the lower right corner of your computer screen to
disconnect the device from the PC.
Select Turn off USB storage and disconnect D3 from PC.
Connect AC adaptor with your device.
Settings > About D3 > System updates, select the storage where the file is saved to start
Upon finishing firmware upgrade, verify the installed firmware version from Settings > About D3
> Firmware version.
Firmware upgrade can also be conducted through MicroSD cards by copying firmware files to the root
folder of MicroSD and inserting the MicroSD card into COWON D3.