The decrypted Pokémon Y Update 1.5 file (usually in .cia or extracted folder format). A 3DS emulator installed on your device. Step-by-Step Installation Step 1: Load the Base Game
What (Windows, Android, Mac) are you using for emulation? Pokemon Y- Update 1.5 -Decrypted- 3DS -EUR USA-...
Official update files are distributed as or installed directly to the SD card. The decrypted Pokémon Y Update 1
If you download a standard ROM dumped directly from a Nintendo 3DS cartridge, it will arrive as an encrypted .3DS or .CIA file. While a physical, modified 3DS console can read encrypted files using its internal hardware keys, emulators cannot. Pokemon Y- Update 1.5 -Decrypted- 3DS -EUR USA-...