3dsx format are not installed, instead, they must be copied to your SD card and loaded via the Homebrew Launcher. This guide will show you how to install backup games and homebrew applications from your SD card onto your hacked 3DS. A hacked 3DS with FBI and the Homebrew Launcher are required to install games and homebrew applications.These are usually installed as part of the hacking process for 3DS.Follow this guide (with pictures) or Plailect’s guide on hacking your 3DS if you have not done so before.