It is as easy as replacing the boot.firm file on the root of your SD card, yes. Alternatively, you can also use Luma Updater from the 3DS itself, which will download and replace the boot.firm file for you. If you want to be able to boot your 3DS with the latest version of Luma3DS without an SD card, you need to make sure you copy the latest Luma3DS boot.firm from your SD card to the root of your CTRNAND. Luma Updater can do this for you. You are free to update your 3DS while using B9S and Luma3DS, so there's nothing wrong with being online. However, if you're going to be online with your 3DS, it is recommended you follow these steps to minimize your risk of being banned: Since you have B9S and Luma3DS installed, you have no need for Flipnote Studio 3D as a homebrew entry point. You can already use homebrew with Rosalina. There are several SNES emulators that could be used on the R4 flashcart, including SnesDS and SNEmulDS. You should use whichever emulator you prefer. However, SNES9x will probably run better. If you use a N3DS, you could just use Virtual Console games, which should run even better. Functionally, neither is better than the other. If you prefer to download CIA files on your computer because it's quicker, you can install those with FBI. If you prefer the convenience of downloading and installing games through freeShop, then use that one.