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.​

 

[Majickhat55]

I like the fact that I can still use my ak2i as a flashcard while having ntrboot flashed to it.
Plus with with, all I need now to hack a 3ds is my phone, a USB SD reader, an otg cable and my ak2i.
Edit: oh and a magnet obviously

Hacks on the go

 

[ilyIzzy]

That worked. Thank you so much. I think it even updated it to the latest firmware.

No problemo, dude. Glad to be of help.

 

[Cuphat]

I like the fact that I can still use my ak2i as a flashcard while having ntrboot flashed to it.
Plus with with, all I need now to hack a 3ds is my phone, a USB SD reader, an otg cable and my ak2i.
Edit: oh and a magnet obviously

All you really need is an AK2i (with its microSD inserted, containing needed 3DS files as well), a magnet (unless target is O2DS), a microSD -> SD card adapter (if target system uses a full-sized SD card), and a screwdriver (for N3DSXL/N3DS targets only).

Take the microSD out of the Acekard and insert it into the target system, insert Acekard and trigger ntrboot B9S to install B9S to the system, then use Luma to chainload GodMode9. Copy the necessary files from the SD to RAMDRIVE, unmount SD and replace it with target's original SD, copy files from RAMDRIVE to SD. Done. Retrieve your stuff for usage next time.

I've got everything I need (except the screwdriver) in my 3DS and its grip:

Spoiler

 

[Hypnotizing]

Does the R4 SDHC Dual core card from r4isdhc.com works with this ?

 

[Deleted member 414991]

Good job making front page!

 

[pixelmasher]

The NTRBoot Flasher can be used as a firmware updater for compatible cards. I guess someone could fork it and turn it into a DS Flash Card Firmware Flasher. Since we can't update most cards using 3DS, this might be a good project for someone who knows how to code.

 

[zoogie]

That worked. Thank you so much. I think it even updated it to the latest firmware.

Do you mind telling us what r4iGold this is?
http://www.r4wood.com/pages/R4i-Gold.html
(mine is top-row, far right. the really old one)
And could you tell us the number just above the rightmost bin on the back? Mines a 5 lol.
(I also have a brand new one that works though at least)

I can actually get it to dump, restore, and flash by changing this 0xA7.... value to 0.
https://github.com/kitling/flashcar...f8dea8aa2aec65a45c/devices/r4igold3ds.cpp#L88
Unfortunately, the patch feature just results in a corrupted card, but at least I can restore it. Shouldn't be much trouble for the ntrboot devs to fix this card since the read/write functions obviously work.

 

[drenal]

Nice... If I had a spare 3ds, a magnet, and a flashcard around I'd try it but I don't so

 

[pixelmasher]

Do you mind telling us what r4iGold this is?
http://www.r4wood.com/pages/R4i-Gold.html
(mine is top-row, far right. the really old one)
And could you tell us the number just above the rightmost bin on the back? Mines a 5 lol.
(I also have a brand new one that works though at least)

I can actually get it to dump, restore, and flash by changing this 0xA7.... value to 0.
https://github.com/kitling/flashcar...f8dea8aa2aec65a45c/devices/r4igold3ds.cpp#L88
Unfortunately, the patch feature just results in a corrupted card, but at least I can restore it. Shouldn't be much trouble for the ntrboot devs to fix this card since the read/write functions obviously work.

Mine looks just like the one on top row, far right. It says C on mine. I think mine was a later batch of the old card. It was my 2nd or 3rd card.

 

[Plstic]

why is the dstwo listed if it's not on the compatibility list?

 

[Deleted member 414991]

why is the dstwo listed if it's not on the compatibility list?

Because it's in development.

 

[Plstic]

Because it's in development.

Who knows how long that will take. I think that the carts not supported now should be taken off the OP.

 

[pixelmasher]

why is the dstwo listed if it's not on the compatibility list?

Planned Cards

• Supercard DS2

 

[Deleted member 414991]

Who knows how long that will take. I think that the carts not supported now should be taken off the OP.

It is clearly listed under 'planned cards'. And there already is a POC of it.

 

[Majickhat55]

Who knows how long that will take. I think that the carts not supported now should be taken off the OP.

Or you could just pay more attention to what you're reading. It's clearly labeled as "planned". Are you honestly that daft? No I'm not trying to be rude but that was seriously an idiotic comment. "Take it off because we're too dumb to read!"...... Wow.

 

[Plstic]

It is clearly listed under 'planned cards'. And there already is a POC of it.

I guess I didn't see that since the OP has some formatting issues.

 

[pixelmasher]

Or you could just pay more attention to what you're reading. It's clearly labeled as "planned". Are you honestly that daft? No I'm not trying to be rude but that was seriously an idiotic comment. "Take it off because we're too dumb to read!"...... Wow.

I think you just described typical noob.

 

[Dr. Dew]

The guide on 3ds.guide says you need a 3ds thats already running cfw to do this. So ppl are still SOL if they only have one stock 3ds?

 

[comput3rus3r]

Does this card work? I have the 2016 version

 

[Quantumcat]

The guide on 3ds.guide says you need a 3ds thats already running cfw to do this. So ppl are still SOL if they only have one stock 3ds?

There is a PowerSaves method in the works.