So I've recently started using CIAs for the lower space they take (among other things), and I've faced this problem sporadically. Some CIAs refuse to import, either immediately, or after going to 99%, giving the error "Invalid CIA". Sometimes this problem is fixed by deleting all other CIA files on the SD card (just the CIAs, not the games themselves), sometimes it doesn't. One particular CIA refuses to import even if its the only one on the card. What can I do? Also, The SD card contains .cia files (for example, if the CIA is 3D Land.cia, theres also a .3D Land.cia). What are these, and can I delete them?