hiyaCFW is a custom firmware that allows running the Nintendo DSi firmware off the console SD card instead of the NAND (internal memory) chip. This is useful because the SD card is replaceable, while the internal NAND chip is weak and has the potential to break.
Alongside the safety benefit, it provides the ability to…
- Safely install apps to the Nintendo DSi Menu with 100% DSiWare compatibility
- Keep settings separate from the one found in the internal NAND
However, unless you specifically want to use the official Nintendo DSi Menu, it is recommended to simply use TWiLight Menu++ instead as the official menu has many disadvantages, such as being more difficult to install games to and slowing down significantly on large SD cards.
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