Ouch. The e250 is a 2GB device; it must be formatted as FAT. For larger capacities, FAT32 is the choice.
Most any answer you may seek for your e200 series is right here in the forums!
Running Rockbox makes things a little different, but remember, the USB connection is handled via the original firmware. What happens when the e250 is plugged in?
The Nuclear option is to reinstall the firmware using Recovery Mode. There is one major warning that must be heeded:
When connected in Recovery Mode, DO NOT attempt to format the device using Windows. It will erase critical data!
Check out this thread. In the thread, I recommended version .18 as the formware, you can interchangeably use the final .24 version, both releases will work fine. Following recovery, you can then check into reinstalling Rockbox if desired.
Bob :smileyvery-happy:
