My ZedBoard will not boot from the SD card. It was able to boot in the past, so I know I have the right jumper configurations. I looked at the SD card, and the U-boot is corrupted. I have tried to install a new u-boot file using the out-of-box demo zip file posted on Digilent. It led me here. However, I am still having trouble installing a new U-boot file. Any help would be greatly appreciated.

