EDIT: This tutorial maybe outdated, technically it still work but please use Plailect's Guide, it covers even more things:



https://plailect.github.io/Guide/



EDIT: MANY USERS ALREADY BRICKED THEIR DEVICE, SO BE ABSOLUTELY SURE WHAT TO DO, THIS IS VERY DANGEROUS. WITHOUT A HARDMOD AND A NAND BACKUP A BRICK IS PERMANENT!!!

I'm doing this tutorial quickly only because we don't want to answer all "How to downgrade" question-threads seperately.

All credits belongs to TuxSH, Jason Dellaluce, Steveice10 (and some other, don't know who else right know)

KEEP IN MIND: BRICKS CAN HAPPEN AND HAPPENED TO SOME USERS!!! NO WARRANTY FOR A SUCCESSFUL DOWNGRADE!

1. You need a 3DS with any hax installed, if you have non, use Browserhax (http://yls8.mtheall.com/3dsbrowserhax.php) by yellows8 or menuhax. And of course, at least boot.3dsx in SD card root.

2. Download sysupdater and, unzip it and copy it to sd card:/3ds/ (if it does not exist, just create it...)
Mirror: https://mega.nz/#!JE1R3RhQ!MqY_OTyYrVM_DMOltiDfaZvTGZ8gCoUcATmOYEimM-U

3. You will need a complete firmware package of your desired Firmware. I recommend 9.2.0-20E/U/J.
Where do you get this package you ask? Well, Nintendo deleted all titles from their server older than 9.9.0-X, so you have to google it. I will help you to google it: http://bfy.tw/3Xqo

Cha0s Em3rald made MD5 checksum's for 9.2.0-20E/U/J N3ds/O3DS, check archive's checksum before using it! https://gbatemp.net/threads/md5-checksums-crc-for-all-9-2-update-packs.408114/

PLEASE NOTE: JP N3DS Users, you'll need to remove the 000400102002CA00 title from the download package in order to not get bricked! Do NOT install it!

4. Copy all firmware title .cia on SD Card:/update/

5. Remove smea's DNS, in case of unsuccessfull downgrade, you need in that case to start 3DS in Recovery mode to update and repair your system.

6. Start 3DS and go into Homebrewlauncher.

7. Start sysupdater

8. Wait for application to be ready. (ca. 1-5min)

9. Press Y to downgrade

10. Wait and pray until "Succeed. Reboot in 10 sec"

11. Done - Downgrade is (hopefully) complete!

I recommend to create an EmuNAND after downgrading and using a cfw Loader, like cakesFW or rxTools.


Q: Help! I have a blackscreen after the reboot!!!
A: Unplug SD Card, reboot. I think some SD data can't aren't compatible with downgraded titles, so delete your current "Nintendo 3DS" folder on SD card, if needed.

If it still doesn't boot, try to get into recovery mode, by pressing Power-Button to boot while holding L+R+Up+A, update and try again.

Q: sysupdater crashes/won't start/freeze.
A: (Hold L+R+DpadDown+B to return to Homebrew Launcher, then) start/reboot again. Some users needed over 30 attempts.
Try another hax; I used menuhax to start ctr boot manager.
TuxSH wrote that it can raise succeed boot of sysupdater if you started 3DS-FTP before and return with L+R+Down+B, then start sysUpdater

Alternative Way:
1. Backup/delete your boot.3dsx in sd root
2. Copy "sysUpdater.3dsx" to root and rename it into "boot.3dsx"
3. Plug SD card in and start hax (recommended: Menuhax)
4. *hax will load directly sysUpdater.

Q: What firmwares can be downgraded?
A: All firmwares up to newesest (10.3) can be downgraded. New 3DS is not confirmed because of no testing by TuxSH, but many users already tried and successfully downgraded their N3DS.

Q: I have an 2DS, which Firmware do I need?
A: Firmware for Old 3DS. MSET for 3DS can wants to move 3d slider after formating - you need to install only Firmware/MSET that was supported by 2DS, so NO 4.5! O3DS 9.2.0-20E should be fine, but not confirmed.

Q: It won't reboot after the finished downgrade.
A: What I did: Waited 10 minutes, then I powered it off. Downgrade suceed. You don't have another choice anyway.

 

[drewby]

It keeps giving me "Failed to get CIA file info!"

 

[GoodCookie88]

Wait no cfw?

 

[drewby]

Wait no cfw?

CFW works, but you need to downgrade first.

 

[GoodCookie88]

CFW works, but you need to downgrade first.

Yeah of course....

 

[Thesolcity]

Mine has been stuck on "Overwrite complete..." for about 5 minutes now.

 

[CrispyYoshi]

Don't forget that Japanese N3DS users must also delete 000400102002CA00.cia from the pack, because attempting to downgrade with it in the folder will brick their systems.

I also heard a lot of issues when setting up the SD card on a mac. Two solutions:

http://gbatemp.net/threads/n3ds-use...oing-to-downgrade.407889/page-14#post-5918593
http://gbatemp.net/threads/n3ds-use...oing-to-downgrade.407889/page-15#post-5919340

 

[hudhair]

I do all of this on the sysNand, right?
thnanks for replying in advance and sorry for being a noob.

 

[chaosrunner]

can i use 3dsnus instead of downloading from google?

 

[Centrix]

Ok so I have successfully dropped back down to firm 9.2.0-20U on my o3ds from 10.3, what now? lol how do I setup emu-nand support and install cia's and custom firmware and custom themes?

 

[Jim~]

Q: Help! I have a blackscreen after the reboot!!!
A: Unplug SD Card, reboot. I think some SD data can't aren't compatible with downgraded titles, so delete your current "Nintendo 3DS" folder on SD card, if needed.

Fixed this for you:

A: This is the result of homemenuhax still being installed for your original 9.3+ firmware when you're launching from 9.2. The fix is to unplug your SD card, reboot, after the home menu loads plug your SD card back in, change to a default theme to erase homemenuhax. You can reinstall homemenuhax again afterwards for 9.2.

 

[chaosrunner]

will this brick my system

 

[zoogie]

will this brick my system

yes it will

 

[chaosrunner]

it has been 2 min and it says #7 : clean memory and release kobject... help plz

 

[chaosrunner]

it is stuck at reboot after 10 sec help

 

[gnmmarechal]

can i use 3dsnus instead of downloading from google?

No, some files are missing.

--------------------- MERGED ---------------------------

it is stuck at reboot after 10 sec help

Force power off. Hold power button.

 

[wurstpistole]

Several people over in my tutorial have the problem that they can't run homebrew at all, just black screen. I suspect there's still something fishy with those downgrades.

 

[FuzzyBabyDucks]

Several people over in my tutorial have the problem that they can't run homebrew at all, just black screen. I suspect there's still something fishy with those downgrades.

Yup. I'm going to try another SD card and see if that changes anything, but I am pretty sure its a bugged DG.

--------------------- MERGED ---------------------------

Different SD card didnt fix anything. seems like a Downgrade issue for sure.

 

[leonmagnus99]

does it matter if the folder that we have the downgrade cia's in titled "update" or "updates" ? i have it titled updates< and right now it is installing the cia's in the sysupdater.

i have tried this since yesterday and no luck, always got black screen after it finished and rebooted. (hopefully maybe this time it will work, i formatted my SD and started fresh)

EDIT : YES YES YES IT WORKED !!!

to all of you i recommend using the normal Windows Computer to format your SD and format it as FAT32 and start fresh, push the 3ds folder alongside the sysupdater in the 3ds folder and the boot.3dsx and try again !

(those without oot etc. update to the latest fw asap which is 10.3 , i did this for my friend too, formatted their SD with windows and set up the files etc. went into InternetBrowser cleared history/cookies and the save data thing, after you reset savedata it should kick you to the home screen, from there hold L+R buttons and wait till it opens your camera then tap the bar code icon and scan the code that is on the smealum website >this will be your entry to HB obviously, and make sure you use the full package of 9.2)

 

[pastwo]

Has anyone tried to do this in 2Ds?
It works?

 

[FuzzyBabyDucks]

does it matter if the folder that we have the downgrade cia's in titled "update" or "updates" ? i have it titled updates< and right now it is installing the cia's in the sysupdater.

i have tried this since yesterday and no luck, always got black screen after it finished and rebooted. (hopefully maybe this time it will work, i formatted my SD and started fresh)

EDIT : YES YES YES IT WORKED !!!

to all of you i recommend using the normal Windows Computer to format your SD and format it as FAT32 and start fresh, push the 3ds folder alongside the sysupdater in the 3ds folder and the boot.3dsx and try again !

(those without oot etc. update to the latest fw asap which is 10.3 , i did this for my friend too, formatted their SD with windows and set up the files etc. went into InternetBrowser cleared history/cookies and the save data thing, after you reset savedata it should kick you to the home screen, from there hold L+R buttons and wait till it opens your camera then tap the bar code icon and scan the code that is on the smealum website >this will be your entry to HB obviously, and make sure you use the full package of 9.2)

black screen after what finished? booting rxtools or downgrading?

edit: Nevermind wrong thread. See if you can install CFW!