Hi all, Thanks for taking the time to read. I'm very noob but I feel I'm close to being able to play the english patched MHX cia (yes I own the japanese cart, this is not piracy, see below) Starting with what I've done so far: Followed guide https://gbatemp.net/threads/tutorial-installing-rxtools-custom-firmware-3ds-and-2ds.390867/ I now have o3ds USA (no flashcart) sysNAND 9.2 and emuNAND 10.3 with CTR Boot Manager starting from cold boot (that is, renamed the ctrb.3dsx to boot.3dsx, homebrew 3dsx to boot_hb.3dsx, so now I can boot straight to RXtools) I injected FBI into the H&S app on emunand, and in rxmode emunand I'm unable to install game CIAs. Error is below: Install failed! Could not install app. Raw Error: 0xd8e0806a Module: AM (0x20) Level: Permanent (0x1b) Summary: Invalid argument (0x7) Description: Invalid signature (0x6a) Installing with BBM and FBI both give this problem at 100% install/import. (edit: also tried both BBM and FBI on 9.2 before I unlinked my nands, same result) Installing BBM, HBL cias worked fine, and I have tried many different game cias for testing, redownloading and whatnot. I must have at least tried 10 times so I feel I can rule out corrupt cia. Also, another perhaps related problem: using the region free launcher, I cannot load MHX (freeze before game loads, requires hard boot). I've been told MHX can only run on new firmware, which is why I've updated to 10.3 on emunand (play MHX on emunand, other games on sysnand) So, this confuses me. When I boot HBL cia from emunand, it loads the boot manager instead... and going to homebrew menu from boot manager, then trying to load the cart region-free produces this error. So to sum up: 1. Why can't my FBI install any MHX cias to the SD? I thought RXtools could bypass signature problems (perhaps this is simply my misunderstanding) 2. How can I get the region free launcher to run on my 10.3 emunand and therefore be able to run MHX cart? It freezes, leading me to believe it's trying on my 9.2 sysnand. Sorry if this has been posted already, I've been searching and reading guides for many hours so I feel I've done my due diligence. Any help is appreciated and if any info is needed, please let me know.