USB Upgrade
1)  Download software to USB disk. Unzip. Copy the image.hex file from the audio folder you require either AAC or MPEG Audio , onto a USB stick.
2) Insert the USB stick to the slot of USB Upgrade while HD3111 is powered off.
3) Keep pressing the OK button and power on HD3111. Two LEDs illuminate.
4) Release the OK button. LEDs flicker. Software upgrade is finished when LEDs stop flickering.
5) Power off HD3111 and then power on again.