You can try by forcing recovery, it might help. Take a look at the Board User Guide https://communities.intel.com/docs/DOC-22475 in section 2.5.4 just follow the steps indicated in there. I hope it works for you.
Unless you incorrectly flashed the SPI firmware, you're unlikely do to something harmful enough to need such a recovery. If everything you did was playing with the configuration of the SD card image, the "reset" would be just to download the image anew, delete everything from the SD card (or format it) and write the untouched image.