It's here!

​

Info

@Normmatt has created a way to run B9S .firm files from bootrom via a DSi Flashcard and a magnet! This works on every 3DS on any firmware version.

For installation without a PC, user @TheCyberQuake has created a pack which will automatically install B9S and copy over essential starter homebrew from the flashcard's SD to the 3DS's. This will mainly be used for PC-less B9S installations. If you have a PC with you, use 3ds.guide. Read more here: https://gbatemp.net/threads/481141/

How does this work?

This works because of a flaw in the bootrom. Before the bootrom boots the NAND, it checks to see if Start+Select+X is held down, and if the shell is closed. If these requirements are met, it will boot an NDS cartridge from the bootrom. This give that cartridge bootrom access. You might be wondering how you'd hold down buttons while the shell is closed, and why you need a magnet. If you put a magnet in a specific spot on the 3DS, it will go into sleep mode. Using this, you can boot the NDS cartridge with the buttons held down while in sleep mode! Using a reflashable flashcard, you can boot B9SInstaller using the flashcard, and easily install it on your 3DS.

The 2DS doesn't need a magnet since a switch puts it to sleep instead of a magnet.

What does this mean?

1. Any 3DS model on any firmware can be hacked with minimal effort
2. You can unbrick any 3DS model from any type of brick.
   - Remember, you don't need a NAND backup for this. Just do a CTRTransfer.
   - This does not apply to MCU bricks.
3. Even consoles with fried NAND, or even the NAND chip physically removed, can use this

This is incredibly impressive stuff, and will most likely be released soon! edit: now!

FAQ

Q: Can Nintendo patch this?
A: Nope! Not without a new hardware revision.

Q: My flashcard is blocked by my firmware! Can I still use this?
A: Yes! The flashcard blacklist is not enabled on the bootrom.

Q: Why can't this work with my flashcard?
A: The installation requires you to flash NTRBoot to the flashcard's nand. Most DS flashcards, such as the original R4, have a ROM, which is not flashable.

Q: Can I install NTRBoot on my flashcard without another 3DS system?
A: If you can run NDS roms on your 3DS with it, then yes. If it's blocked on your 3DS version, then you'll need another 3DS system to use it.

Q: Will my 3DS flashcard work?
A: No, only the NDSi flashcards listed above.

Q: Will any other flash cards work?
A: Only the ones listed in the OP. However keep in mind that flashcards such as the DSTT, Supercard DS2 and R4 SDHC Dualcore are planned to be supported in the future.

Q: I tried to do this with my cartridge and it didn't work?
A: It doesn't work with regular DS cards.

Q: Can I unbrick from a ____ brick?
A: Considering the card has access to the bootrom, yes! This can unbrick any brick (except MCU), unless you've taken a knife to the motherboard.

Q: Can I install B9S on the latest firmware with this?
A: Again, since the card has access to the bootrom, you can do this easily! Just plug in your flashcard, boot up using the magnet and button combination, and install.

Q: Does this work on the New Nintendo 2DS XL?
A: Yes!

Release
Guide
Free NTRBoot Flashing
Free B9S Installations

Here is SciresM's post about this

Please see SciresM's presentation on bootromhax.​

 

[TheDandyHoneybadger]

In the "The ultimate list of NTRBoot compatible flashcards" thread, it says that: "R4iTT 3DS (r4itt.net)
This seems to be a rebrand of the r4igold.cc cards. The support is only experimental. These cards currently can't be detected properly!"

So if i try to flash my R4iTT Flashcard with NTRBoot, it might work?

 

[Megadriver94]

What CFWs other than Luma, and ReiSIX still work on the latest firmwar of 11.9?

 

[longnosedgoblin]

I have a 2dsxl and an r43ds+, be fore I run the hack I just wanted to check is it best to update to the latest official firmware then do the ntrboot?

 

[BaamAlex]

Ntrboot works on every firmware and on every 3ds model. It's doesn't matter on which firmware you are using ntrboot. All what you need is a ntrboot compatible flashcard and a magnet. Read the op. The flashcards blacklist is not enabled in the bootrom @longnosedgoblin

other than Luma, and ReiSIX

This are the only two firmware which works on the latest firmware. And rei-six is no longer supported.

 

[longnosedgoblin]

Yeah I knew it worked on all firmware’s just checking if it’s best practice to do the official firmware first then the hack.

 

[BaamAlex]

The firmwareversion doesn't matter

 

[Technicmaster0]

In the "The ultimate list of NTRBoot compatible flashcards" thread, it says that: "R4iTT 3DS (r4itt.net)
This seems to be a rebrand of the r4igold.cc cards. The support is only experimental. These cards currently can't be detected properly!"

So if i try to flash my R4iTT Flashcard with NTRBoot, it might work?

It might work but I'd say at least 80% chances of bricking the cartridge and not beeing able to install NTRBoot.