It doesn't "boot" from the sdhc, it resets itself. After a minute or so, both the red and green like should be blinking together. Once that happens, power down, put the jumper back, reassemble, and it should boot back to the original factory firmware.
I got it. Although the instructions weren't thoroughly clear on the bitmain page where to switch the jumer. It took alittle working on it but I finally did it. Thank you!