Wow, that’s a v2 model with the original firmware; where on earth did you find this jewel?
Only problem is, SanDisk forgot to put the option to switch the USB mode into the original firmware, so you must update it (you’d want to anyway). Go to this post and follow the manual installation instructions for Mac and Linux users (even though you may have Windows); this tells you how to ‘force’ MSC mode so you can update the firmware. The links to the different geographical firmware versions are in this post as well. Download the appropriate one, and follow the instructions.
Congratulations on a great find; that’s an awesome player. Ain’t nothin’ built like that in SanDisk’s line anymore. 
