[zak4]

I managed to open the C280 without damage. It's not too difficult starting at the top right edge of the player and going around counterclockwise. No danger to damage the earphone jack at the C280.

Does anyone know the exact parameters of the battery ? I couldn't find anything about it. And another thing: Where is the firmware stored ? In the NAND memory chip ?

I also added some pictures in the gallery section.