It seems as though there’s an issue with the Rockbox firmware. Try booting into the SanDisk firmware by holding the left (REW) button while booting up. Then you can format and/or re-install Rockbox.
It seems as though there’s an issue with the Rockbox firmware. Try booting into the SanDisk firmware by holding the left (REW) button while booting up. Then you can format and/or re-install Rockbox.