Google is your friend. bios and nands are on there somewhere.
As I said, I am not going to waste more time searching on Google. My goal is doing security research and exploit development; not dealing with the setup problems. I have much better things to do that searching for the way to setup the debugger and the games/apps (flipnote) I am going to try.
the bios is already included if you downloaded the "no$gba with dsi emulation" that's floating around. just replace the no$gba.exe with debug version one. (I'll see what i can do on the nand part)
I have a working debugger with files I found on Reddit (the DSi user is Nethan). But it does not have flipnote installed, so I cannot directly work with it. I do not want to waste time on trying to install the game/app, I want something ready to use. Maybe it is not the way I should do it, but my goal is clear, I do not want to deal with anything else. Preparing the setup seems to be very time consuming, and I have better things to do. Thank you very much for your help.
It is simple, preparing the setup seems to require too much time, and it requires too much time searching on Google for nand dumps, the way of installing apps/games, etc. The time needed to start with my main goal is very elevated for me. It is not worth it. I do not want a hack for my DSi, I just want to practise security research on this console and develop some exploits (if possible).