Disclaimer; I'm not responsible if any thing goes wrong, and your 3DS bricks. This is a simple tutorial I am making if any one needs it, this is more for developers than the average users as it is a Dev FW. I only tested this on my 2DS so far so if you have success please say so in the comments. The firmware CIAs are USA region, so if your 3DS is not USA, use Plailect's guide to region change to USA. Update; There seems a problem installing Dev FW on N3DS, I do not know a way around this, sorry. If anyone can get this to work on a N3DS leave a comment explaining how you got it to work, please. First you need some files. sysupdater (Alt. Link) Dev & Factory Titles (No link look on "that 3DS ISO Site") Retail Encrypted DevApps (No link look on "that 3DS ISO Site") Luma3DS (Nightlies) Setup Luma3DS (click it is a link). Extract 11.4.rar and rename the folder to "updates", delete 000400000FF40102.cia and 000400000FF40002.cia. Extract DevMegaPack.rar and rename Config_v11_4_NAND.cia and DevMenu_Nand.cia to 000400000FF40102.cia and 000400000FF40002.cia then copy them to the "updates" folder. Move the "updates" folder and the sysupdater.cia to the root of your SD card. Boot Luma3DS, hold select, enable Developer features, load EmuNand. Use FBI or something to install sysupdater.cia. Close FBI and open sysupdater. We're downgrading, so you need to press the Y button. Wait and DO NOT touch anything. The app will tell you when it is done (It takes less than 5 minutes). Once the app says it is done, wait, it will reboot automatically. Done, now have fun! To get Test Menu Once your at the home menu open "CONFIG", select "Menu Setting", select "Menu", press up to "test menu". Press B x2, press "Power" to reboot. To get out of Test Menu Press Start to open DevMenu scroll to CTR-P-CFGO and press A to open "CONFIG" Select "Menu Setting", select "Menu", press down to "home menu" Press B x2, press "Power" to reboot. Extra Info While on the Dev FW you the ability to press X + Y on the home menu to display debug banner info. Also press X + B to change the banner region, so you can view the other versions of banners. Your 3DS's firmware version in System Settings displays 0.0.0-0U. Open "CONFIG", select "Debug Setting", select "Debug", press up to "enable" to get more options in the Test Menu. Source Disclaimer; Again I'm not responsible if any thing goes wrong, and your 3DS bricks.