The very first flash cartridge that is compatible with the Nintendo 3DS is the Acekard 3 3DS. It is able 
to play the DS roms as well ashomebrew game for the DSi and of course, run the games for the 3DS. However, it is a fact that it simply serves like a modified version of the earlier Acekard 2i that has a firmware compatible with the Nintendo 3DS, with the packaging as well a newly-designed logo. With regard to compatibility concerns, there is nothing new with the AK3 DS. It would also be difficult to say which among the two is more effective, although the latter is backed by a strong development team which can surely be destined to succeed.
Website: www.AceKard 3.com
There will surely be that possibility that the players would get to see much more game roms that are set to be released for the 3DS in the near future. However, what cannot be foreseen is if the latest adapter kit for the flash card will have any improvements as compared to what is currently being offered.
But players may still see changes in order to get the 3DS homebrewed, like the custom firmware. It can also be seen when the 3DS roms will be played from the card slot of the SD. If you are really interested with getting to play all the games in DS, 3DS Homebrew that you like, then you can rely on the Acekard 3.
Copy NDS / 3DS ROMs to microSD card -> Put the card into Flash Card Adapter -> PLAY!
Advantages:
- It is the very first commercial flash kit compatible with the Nintendo 3DS all over the world.
- It is backward compatible with the DS Lite, the original NDS, as well as with the Nintendo DSi which even includes a slot-2 functionality for the DS-Lite as well as the NDS
- It is compatible with the microSD as well as the MicroSDHC which can be updated so that it would work on microSDXC cards that have a capacity of about 32GB+.
- It is 100% compatible with the NDS ROM and it supports 3DS rom as well
- It allows full download for the DS
- File management is already built-in
- The graphic user interface looks good and it can be customized as well.
- It has support for cheat codes and even for Soft-Reset and provides a walkthrough for the 3DS.
Disadvantages:
- There is no other available color for it except black
- It still lack certain features and does not have support for the 3DSWare
- There is still the possibility that the update for 3DS firmware would lockout those who use AceKard 2i.
Acekard 3 3DS, the first Nintendo 3DS compatible flash cartridge … Or is it? In a way it is. It can play DS roms & DSi homebrew games and run on the Nintendo 3DS. But in reality it is not much more than a modified version of the good old Acekard 2i with the firmware made compatible with Nintendo 3DS and in a packaging with a new logo. AK3DS Does not bring anything new to the table as far as NDS rom compatibility is concerned.
Hard to say how much better than AK2i the Acekard 3DS will be but with a strong developer team backing it but it is destined to success. There is a small possibility that the car can be blocked by a 3DS firmware update from Nintendo. If you are not aware Wii, 3DS™ & Nintendo DSi firmware is fully unpalatable, so in theory Nintendo can release a patched version of he firmware that would block R4 DS and AceKard cards from working on 3DS, but You can choose not to update until a workaround is found and flash card firmware is updated accordingly. Will it happen? It remains uncertain. It depends on the method that you can at work AK3 3DS, and if Nintendo locked the firmware. Even if I updated my DS Acekard v1.0J 3 3DS on v1.1J and works well.
Despite everything mentioned above Acekard 3 3DS is a very good flash kit. Like the original Acekard RPG and Acekard 2i were. What you have in this cart is a robust, fully customizable graphical user interface, 100% compatible with all NDS rom games, good compatibility with 3DS roms, the full support of DSi homebrew and many additional features that work very well. It even offers come extra features missing from R4 cards or SuperCard ® , as slow-motion real-time support and storage, for example.
The fact is that we see more game roms released for Nintendo 3DS in the very near future, but we can not know is whether this new flash card adapter kit is an improvement over the offering which is currently Acekard 3 3DS. However, we can see a different game changes to make the Nintendo 3DS homebrew, such as custom firmware or playing 3DS roms from SD card slot just waiting to be explored. When what really matters for you is playing all your favorite DS and 3DS Homebrew – then Acekard 3 3DS is your only option – but a very good choice. It is a proven car that has task is not simple and good.