Dave J Murphy has finally cracked DSi mode. Note this will not allow you to play pirated games such as DSiWare, or other DSi ROMS. This will allow you to load DSi mode homebrew over Wifi.

While playing around with the save game exploits for Cooking Coach and Classic Word Games I created last year I discovered two things about the flashchip on the wifi module where the firmware would be stored on a normal DS. (1) It contains only the setup data for wifi, the user settings and the wifi connection settings and, (2) Part of it is writable, from DS mode. This was what finally gave me the motivation to revisit an old project to upload homebrew to the DS over wifi.

installDSiLink.nds will, when run from a DSi compatible card in DS mode, write the dslink client to the wifi flash chip and this can then be bootstrapped from the save game exploits mentioned above. You’ll need to write the appropriate .SAV file from this archive to your game of choice from either a DS with eepinator or use one of the save game transfer devices around. Cooking Coach is more convenient since the exploit kicks in just after the splash screen, with Classic Word Games you need to go through a couple of menu options.

Unfortunately testing revealed that later model DSi and XL consoles have had their security beefed up a little. You’ll know if you have one of these consoles if either the installer fails to write the loader or the loader fails to connect when bootstrapped. Sorry if you have one of these consoles, you’ll have to wait a little bit longer to play with DSi mode.

libnds still needs some more updating to deal with DSi mode features, currently audio and touchscreen don’t work and the swi decompression functions seem to have changed. Hopefully now there’s a reasonably straightforward way to run code we can get a few more people looking at what we need to change and how best to approach it.

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