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I'm new to all of this, so the lingo is still hard for me to understand. Is a prepatched cia something akin to a rom? I ask because my sd card is only 2gb, and I've also already bought the actual mhx cartridge.
Then you will need a bigger SD card (at least 8GB, since you'll need emunand, which uses ~1GB of the SD card), a PC with SD card reader, 7-zip or WinRAR (preferably 7-zip), Gateway's 3.1 Launcher.dat, the patched MHX .cia file, Internet access, and an o3DS with firmware between 7.0.0 and 9.2 (preferably 9.2). You'll also need to get rxTools' latest version on the SD card.
Step 1 - Setting up emunand: Just follow the guide here.
Step 2 - Installing FBI (to be able to install .cia files):
A.) Launch rxTools.dat by going to launch.rxtools.net in the Internet Browser of your 3DS
B.) Go to Other Options->Install FBI over Health&Safety App (Note: If the H&S app isn't installed on your real nand, you'll need to do a System Format while in your emunand (also, while in emunand, going into System Settings, then exiting will always boot you back to your real nand, requiring you to launch rxTools again. Keep this in mind while using emunand. You can tell when you're in emunad if the bottom-right corner says RX3D <your firmware version>.) The FBI injection app will give an error, which is normal. Write down the region and version number given in the error.
C.) Go to the rxTools' \release\Tools\fbi_injection\<region>\version\ folder, then copy the fbi_inject.app and fbi_inject.tmd files to the root of your SD card.
D.) Go to Other Options->Install FBI over Health&Safety App once more. It should not give any errors this time.
E.) Load emunand through rxTools, then launch the H&S app/FBI.
F.) Make sure the second line on the top screen says 'Destination: SD, Mode: Install', highlight your patched .cia, then press A to install. (Note: it will take quite a while to install, so make sure that you plug in your 3DS while it is installing.)
G.) Exit FBI by pressing Home (you'll get to 'unwrap' your patched MHX here!), highlighting the H&S/FBI app, and pressing X.
H.) Launch your new patched MHX.
I.) Enjoy!
If you want, you can bookmark/favorite this post until you get a bigger SD card. Just look to the bottom left of this post where it says 'MarcusCarter, <post time>', click on the <post time> text (it will reopen this thread, then scroll down to this post automatically), then bookmark/favorite the page as usual.
Hope this helped. Also, as a side note, I got too tired last night while trying to type up this post, so I'm sorry if it was a little delayed.