Use the homebrew application ftpd. install and launch ftpd app on your console. Then use any FTP Software such as FileZilla on you PC to connect to the 3DS over wifi. Using the ip address shown on the top screnn of your console to browse files and folders on the consoles MicroSD card.

Alternatively you can use the homebrew app 3DShell a multi purpose file manager for the Nintendo 3DS with built in FTP to transfer and manage files on your console.

 

Try the alternative, 3DShell (3ds) and WinSCP (windows).

• How to recover your 3DS SD card by transferring files to your computer using wireless FTP because Windows refuses to recognize the card and wants to reformat it. *

Ignore the parts that don't apply to you; focus on steps 13-18.

***

There's also the (unsecured) SMB wireless transfer with microSD Management (3ds) and muCommander (windows).

• How do I hack a 3DS without a SD card? [post #41]

 

Hey, guys think I brick my 3ds, I updated the system to the newest one since I haven't touched it in a year or so and just realize I got luma 9.0 and godmode9 v1.5.1 on the device after pressing update, I tried to add the newest boot.firm into my sd card(brand new SD card so everything is gone) but it doesn't seems to work since it still show "AN ERROR HAS OCCURED FAILED TO APPLY 1 FIRM PATCH(S)". Currently, i don't have any backup of my data but i can go to the luma setting by holding select and it shows luma 3ds v9.0 configuration.

currently, I'm trying to follow these step by @TurdPooCharger:

1. 
   
   
   • Copy everything off your SD card onto a computer.
   • Reformat the SD card with MiniTool Partition Wizard (free edition) with these settings:
     • Format: FAT32
     • Cluster Size: 32 KB
       
     • Partition: Primary
     • Disk: MBR
     MiniTool Partition Wizard Software Tutorial Guide
     1. Delete Partition
     2. Initialize to MBR Disk -or- Convert GPT to MBR Disk (if it's in GPT Disk)
     3. Rebuild MBR
     4. Create a New Partition [ Create as: Primary | File System: FAT32 | Cluster Size: 32 KB ]
   • Full Write + Verify the empty card in H2testw. Do not skip this step.
   • If the card passes the test, delete the *.h2w test files.
     • If the card failed hardware inspection, replace it and go back to steps 1 or 2.
   • Download the CFW starter kit found here. Extract the files onto the root of SD card.
     • Do not add back your main setup at this moment.
   • Insert the SD card into the 3DS, turn on the system, and hold the (SELECT) button.
   • You should see Luma3DS v9.1 configuration. If you do, use these settings:
     • 
   • You will need to follow this up with Updating B9S and Finalizing Setup

hoping that step will fix it but i'm not too sure if it will


Yeah it seems to work now thanks @TurdPooCharger, i just need to update the luma3ds to 10.1 probably, do i also need to update my 3ds to the latest firmware now?

 

Ok so looking for some help after 2 days of trying a bunch of stuff, this is my last try before building new micro sd card
I followed /3ds.hacks.guide/ to the T, everything went flawlessly on my 64gb installlation
start installing games, play a few, everything still works perfect, quickly realize I want more space. I upgrade to a new micro SD card, format fat32, copy 64gb micro sd card contents to windows desktop. copy content onto new card (as everyone says to do)
THIS is where my trouble begins (mind you at any point I can slap 64gb card in and everything works fine)
SO when i boot 3ds with 256gb card i get '1blue light flash' no boot,
- I can boot into Lumas3DS menu with the SD card in
- I can't boot godmode9 with the SD card in
- I can boot with no SD card and pop it in and on homescreen all the icons of installs are there
and 1/2 work fine and other 1/2 blank top screen and error if i try to boot (FBI and HomebrewLauncher both do not work but have icons on home screen nothing on top screen)

I have reformatted the 256gb card multiple times, copied 64gb (working still) onto PC twice now and attempted to copy contents 6 times, 4 times w/ windows and twice with teracopy.

The result is always the same, with the same apps being effected. (im moving about 57gb of data on xfer)

CAN ANYONE offer some insight maybe something I missed? everyone seems to make it seem like the xfer is as simple as format fat32 and copy contents but obviously it isn't working for me and still works on my original SD card I installed CFW with. It took me almost 10h+ to get the 64gb card where its at and id love to not start from scratch and build from there on my new card.

ONCE again any help is welcomed. ty for your time.

 

yea I suppose was just not wanting to go through the return process

The media is likely to be defective.
29.2 GByte OK (61264439 sectors)
24.0 GByte DATA LOST (50347465 sectors)
Details:0 KByte overwritten (0 sectors)
0 KByte slightly changed (< 8 bit/sector, 0 sectors)
24.0 GByte corrupted (50347465 sectors)
0 KByte aliased memory (0 sectors)
First error at offset: 0x000000074da46e00
Expected: 0x000000074da46e00
Found: 0x45439ac6bd3c7a8b
H2testw version 1.3

thanks for the help will begin to look for another micro SD card

 

I was playing mother 3 on mGBA and tried to save which crashed the game, and my 2DS XL wanted to update previously, so it did and now it won't turn on, is there anything I can do to fix it?