4.x系统3ds已可不用烧录卡直接玩3ds游戏rom

(4.x only) CIA CFW Complete Guide
As of now this guide requires a 3ds flashcart that allows eShop access, or an eShop game to already be installed on your SD card. I will assume ownership of a Gateway cart, but the steps should be very similar regardless of what cart you own.
Make sure your 3DS is configured to connect to the internet properly before going any further. Write down the LAN IP of your 3ds for later.
Copy the Rop Multiloader to your DS mode flashcart. Launch the Rop Multiloader rom from your cart and select "Gateway 4x"
Copy the Gateway Launcher.dat to your SD card, and load it with the usual exploit. Select "Nand Backup".
When it finishes, copy the nand.bin from your SD card to your computer.
If you have not already done so, boot the Gateway Launcher and select "Format Emunand". Be careful, as this will erase all the files on your SD card.
On your SD card navigate to "sdmc:/Nintendo 3DS/<id0>/<id1>/dbs/". Create two files in this folder named title.db and import.db . Put the SD card back in your 3ds and go to System Settings, and attempt to manage the SD software. Let the 3DS do its repair process.
Mount your SD card on your computer. Make a backup of the card with Win32DiskImager.
Open Hex Workshop as administrator. Select Disk-> Open Drive. Choose "All" from the drop down menu and select the disk with the size matching your SD card. Once opened, the very beginning should say "GATEWAYNAND"
Choose Disk->Restore Sectors and select your saved nand.bin. Change "Starting Sector" to be "1".
Now that that is finished, your SD is ready to launch the CFW. Copy the contents of the folder "SD Card" folder to your SD card.
Launch the "Rop Multiloader" from your DS cart again. This time select "Homebrew 4x".
Finally launch the exploit the usual way, and make sure to hold down the L Button. it may take as many as 10 tries to work, but don't give up. You will know it worked when the screen flashes white then black for a second.
Download "DevMenu_2x.cia" and put it in the "Palantine CFW" folder.
On your computer, in the CFW files, edit run.bat and replace "IPTOMODIFY" with the IP of your 3DS, and then run it by double clicking it. This will try to install the DevMenu onto your device.
Reboot your 3DS and launch the CFW again. If it worked you will see a present on the homescreen.
Congrats! You have installed a CFW to your 3DS!
[Tutorial] Converting .3DS to .CIA for Dummies!

刷CFW還是要燒錄卡的