Refresh the Title DatabaseSometimes the 3DS internal database gets "confused." You can force it to reset by following these steps: Power off your 3DS and insert the SD card into your PC. Navigate to the /Nintendo 3DS///dbs/ folder. If you see files named title.db and import.db, delete them.
A "ghost" or failing SD card may show enough space but fail to write data correctly. failed to install cia file 0xd8e0806a updated
: Check System Settings > Data Management > Nintendo 3DS on your console to see how many blocks are free. Ensure the free space is at least double the size of the CIA file you are installing. failed to install cia file 0xd8e0806a updated