I recently installed FBI on my 18.104.22.168U Old 3DS. Since I use a 2GB SD card, I had to backup many of my normal 3DS files to make space for everything. After installing FBI and restoring the original files to the SD card, all the demos I had suddenly appeared as gifts, and when I opened them they were black squares. Each demo still states how many times I've played it, but when I try to play one of the black square demos, I get a message saying the sd card was removed. I've tried two different SD cards with the same issue. I also restored my NAND that I had from before installing FBI using dgtools, but I still have the same issue, although FBI is gone. How can I get the demos to display properly and run as they used to?