Haku33 - Clean Switch NAND / Restore Stock OS without Backup

This guide will show you how to use Haku33 by Kronos2308 to delete custom firmware files and logs from your Switch console. This is useful if you wish to “clean” your system, return to the stock firmware and play online without being banned. This method will completely erase the information on your Nintendo Switch’s SysNAND (Internal Storage). Backup your saves with EdiZon. SD files or games installed to your SD (on EmuNAND) will not be touched.

If you plan on running SysNAND and EmuNAND concurrently, it is advised to create your EmuNAND partition prior to cleaning your SysNAND. You will require hekate to boot into stock firmware on the SysNAND, this comes with the added benefit of not burning fuses as long as Auto-RCM is enabled. hekate is safe to use with stock firmware, as it is a bootloader and does not store files on your NAND.

If you do not plan to use EmuNAND and wish to use only the stock Nintendo Switch official firmware, disable Auto-RCM in hekate and allow your Switch to boot as normal.

Like with all homebrew that make large changes to your Switch’s internal storage; it is advised to create a backup of your NAND before running Haku33, just to be on the safe side.

Before you begin, it is strongly advised to disconnect your Switch from any Wi-Fi networks and delete all Wi-Fi networks saved on your console via the [System Settings] -> [Internet] -> [Internet Settings] menu and enable. This is to protect you from bans in case your Switch connects to the internet without your
discretion.

It should be noted that there is no known fool-proof way to prevent bans entirely other than not using hacks at all. Going online greatly increases your chances of being banned and the methods detailed here have shown to lower that risk. There have been no known cases of users being banned for using Haku33 or EmuNAND alone, however these methods are prone to human error. Users should take care to keep their SysNAND Stock OS environment as clean as possible, and also to never connect to the Internet with EmuNAND unless Incognito is activated.

Required Downloads:

Requirements

Nintendo Switch with Custom Firmware

The Haku33 requires a hacked switch with CFW such as Atmosphere
You cannot run homebrew applications with unhacked or stock Switch consoles
This guide assumes you have all the basic requirements to enter RCM and boot into CFW

Installing Haku33

You will be running Haku33 on your SysNAND so temporarily disable any EmuNAND setups if you are using one. This can easily be achieved by temporarily renaming the /emuMMC/ folder on the root of your SD.

You must remove Incognito from your SysNAND if you have it currently activated. Your Switch will be unable to connect to the Nintendo servers even after restoring with Haku33 if you do not restore your identification information first. Ensure all internet connections are deleted from your settings.

Copy Haku33.nro to the /switch/ folder on your SD card
Insert your SD card into your Switch and push your preferred payload to boot into CFW
From the Home screen, launch the Album to access the Homebrew Menu
Some CFW setups may require you to hold [R] or [L] to open the Homebrew Menu from the Album

Cleaning NAND

Launch Haku33 from the Homebrew Menu
Press the [ZL] + [ZR] + [+] + [-] buttons together to begin
Wait for your Nintendo Switch to reset (or enter RCM)

Your NAND has now been cleaned. If Auto-RCM was enabled, your Switch will enter RCM and you will require hekate to boot into stock official firmware. If not, you Switch will boot into the initial setup screen

Your previous /Nintendo/ folder will be backed up as /Hamburgesa_Nintendo/ on the root of your SD

Now is the best time to create a clean Switch NAND backup with hekate if you do not have one.

Booting into Stock Official Firmware from RCM with hekate

hekate is safe to use with stock firmware, as it is a bootloader and does not store files on your NAND

Insert your SD card into your PC
Copy the /bootloader/ folder from the hekate .zip file to the root of your SD card
Extract the Atmosphere .zip file and copy fusee-secondary.bin to the /bootloader/payloads/ folder on your SD card
Go to the /bootloader/ folder on your SD card

Open hekate_ipl.ini in Notepad and add the following lines to the file and save

[Stock (SYSNAND)]
fss0=bootloader/payloads/fusee-secondary.bin
stock=1
emummc_force_disable=1
icon=bootloader/res/icon_switch.bmp

switch emunand hekate_ipl ini atmosphere fusee secondary bin

Insert your SD card into your Switch and push the hekate_ctcaer.bin payload
Select [Launch]
Select [Stock (SYSNAND)] to boot into stock official firmware
Your Switch will boot and load into the initial setup screen

You can now sign in to your Nintendo Account or create a new one to access the eShop.

You can also update your SysNAND firmware via Nintendo servers, EmuNAND firmware will be unaffected.

Updating your Switch’s stock firmware will remove Auto-RCM and your anti-downgrade fuses will be burned once your console resets then boots without hekate. To update firmware via Nintendo servers and prevent fuses burning, insert your RCM jig before beginning the update and hold [Vol+] as soon as your Switch completes the update and prepares to Restart. Your Switch will enter RCM and you will be able to re-enable Auto-RCM with hekate.

You must restore your /eMMC/ folder if you wish to boot into EmuNAND, DO NOT inject your CFW payload without ensuring that the EmuNAND is enabled. This could lead to unintentionally getting your SysNAND banned.

enable rename emummc folder haku33 emuand

Congratulations on successfully cleaning your Switch NAND and restoring the official firmware. You can now enjoy the online services while still having access to custom firmware via the EmuNAND if you wish to do so. Ensure that you keep the SysNAND environment clean and create a fresh NAND backup now if you haven’t already.

Credits

Kronos2308

StarDustCFW

Haku33 - Clean Switch NAND / Restore Stock OS without Backup

Nintendo Switch with Custom Firmware

Installing Haku33

Cleaning NAND

Booting into Stock Official Firmware from RCM with hekate

Switch Homebrew and Games

Backup Nintendo Switch System to SD (Recommended)

Block Switch Updates via DNS

EmuNAND Setup – Use CFW and Stock Firmware (for Online Play) without Ban Risk

Hack Your Switch and Install Games without a PC (Atmosphere + Tinfoil / HBG Shop)

Incognito – Block Nintendo Servers and Hide Switch Identification Info on CFW

Credits