If you are looking for a specific or installation guide for a custom firmware setup, let me know: Are you using a standard 3DS or an emulator like Citra? Do you need help with FBI installation steps?
Version 1.5 includes all previous fixes, such as the infamous Lumiose City save glitch (v1.1) and Wonder Trade move-learning bugs How to Install via CIA (Modded Systems) pokemon x update 15 cia top