Upgrade File YP-S2 Firmware (V1.01. - 2008.5.19 how to upgrade1. Connect the YP-S2 device with the USB port of the PC through the USB adaptor.2. Copy the rom file( YP-S2.ROM ) in the root of the S2 device.3. Safely disconnect the YP-S2 with the PC.4. Turn on the S2 device, and then during the firmware upgrade is progressed, the green and blue LED is turning on and off, if it is completed, the S2 device is turned off automatically.If the firmware is not upgraded, after the S2 device is charged, try it again.5. Turn on the S2 device, and then it enters into the play mode.