Heres a bit more info...
When i turn my player on, i can access rockbox perfectly fine, all the tabs work, when i plug the usb be cable in, i get the USB picture on the TFT screen, but i doesn't register with my computer...
when i tried to boot from the original sansa drive, using the |<< power combo and i got an error:
Partition 0: 0x0b 3814mb
Loading original firmware. . .
Rockbox error: -4
i was thinking of pasting the original mi4 file into the recovery partition, but i dont want to brick my sansa, so some input would be nice