GAMEBOY/ GAMEBOY COLOUR/ GAMEBOY ADVANCE:
Buy a gameboy flashcart to the corresponding gameboy model, then put the operating system for the flashcart on the micro-sd card of the flashcart drop some games in and you're done!
DS/ DS LITE (works with any DS model)
Best way to hack it is with a flashcart called "R4". The best one out of all them is ACE3DS+. Then, download twilight menu++ for the flashcart, then to the corresponding flashcart go to flashcart loaders file and drop the files that are inside a folder that is the name of your flashcart into the root of your sd cart. Autoboot is not required, but only if you wanna boot into it automatically. Drop boot.nds, _nds and _gba into your sd card and put it i n the r4 and youre done!
3DS:
WARNING!! By modding your console, you subject it to the remote (but non-zero) possibility of the console being bricked (rendered non-functional). Incorrect file placement wont brick the console, but purposely skipping instructions might.
- Power off your console
- Hold the (Select) button
- Power on your console while still holding the (Select) button
- If you do not see a custom menu (your console just boots to the HOME Menu), you may proceed to the next section.
IF it boots to a custom menu, STOP RIGHT NOW! it already has Custom firmware installed.
To proceed, go to this website and find the information.
Nintendo switch (2):
WARNING!!
I dont know if this can work on the switch 2, and because of the big modification wall, it might brick it.
Bricking Risks:
We ask that you acknowledge that EVERY time you modify your system, there is always the potential for an UNRECOVERABLE brick. A brick is a damaged device that can no longer function; in other words, something that becomes "as useful as a brick".
Bricks are rare on the Nintendo Switch, but still a possibility — so make sure you read the directions CAREFULLY before performing them, and follow them EXACTLY.
Keep your device plugged in and charged throughout the entire process to avoid data loss or damage from an unexpected power-off.