@xtrasmiley, if you’re comfortable with using the command line, you can just simply use dd to write the firmware image onto an SD card, like so:
dd if=ossc_firmware_image.bin of=/dev/your_sd_card
Just substitute the parameters with the actual firmware image and block device.
Edit: I think I should add that you have to be absolutely sure that you use the correct block device! The dd command is dangerous.