Part 1 (ReiNAND)

The final step of this guide is to install arm9loaderhax and setup CakesFW to run just milliseconds into the boot. This is accomplished by using SafeA9LHInstaller by AuroraWright, then setting it up to work with BootCtr9, a boot manager that lets us load things on boot.

This will install Delebile's Fork of arm9loaderhax.

If you followed an old version of this guide that did not include Updated SysNAND and want to switch to Updated SysNAND + Cakes, just do this entire Part, but skip "Section II - Installing arm9loaderhax"

If you currently have Updated SysNAND + Luma3DS / AuReiNand and want to switch to Updated SysNAND + Cakes, just follow "Preparatory work" and "Configuring CakesFW".

If you are running an Old 3DS, please note that you can't run games with reboot patches (DSI/GBA and External RAM games(Monster hunter 4 ultimate and Super smash bros for Nintendo 3DS)

This guide uses "Updated SysNAND" mode, in which we copy our RedNAND to SysNAND (to keep games and such) and install arm9loaderhax to have permanent SysNAND hax with no RedNAND required at all.

We will also setup the ability to launch Hourglass9 from arm9loaderhax, giving us the ability to unbrick our SysNAND from situations that would normally brick us by restoring from backup.

What you need

• My zip with all needed files
• The latest release of hblauncher_loader
• The latest release of Hourglass9
• The latest release of EmuNAND9
• The latest release of Uncart for arm9loaderhax

Instructions

Section I - Preparatory work

2. Delete the Decrypt9 folder from the root of your SD card if you have one
3. Extract my zip to the root of your SD card
4. Copy your console specific OTP.bin (the one you got in Part 4) to the /a9lh/ folder on the root of your SD card
5. Copy hblauncher_loader.cia from the hblauncher_loader zip to the root of your SD card
6. Copy Hourglass9.bin from the Hourglass9 zip and arm9loaderhax.bin from the Uncart zip to the /a9lh/ folder on your SD card
7. Rename arm9loaderhax.bin from the Uncart zip in /a9lh/ to uncart.bin
8. Copy EmuNAND9.bin from the EmuNAND9 zip to the /a9lh/ folder on your SD card
9. Copy your emuNAND_original.bin backups from Section I to the root of your SD card

Section II - Finalising setup

15. From EmuNAND Manager Options, make a backup of SysNAND to sysNAND.bin
16. Press Select on the main menu to eject your SD card, then put it in your computer
17. Rename sysNAND.bin to sysNAND-A9LHAX.bin and copy it to a safe location on your computer; this is a SysNAND backup containing arm9loaderhax
18. Delete sysNAND-A9LHAX.bin from your SD card
19. Reinsert your SD card into your 3DS then press Start to reboot
20. Update your CFW SysNAND to the latest version using system settings
21. Open Health and Safety (which is now FBI)
22. Navigate to hblauncher_loader.cia and press A to install
23. Exit with the home button
24. Launch the HomeBrew Launcher from the home menu icon at least once to download the payload

If everything has gone according to plan, arm9loaderhax will be installed to your device, your RedNAND will have been copied to your SysNAND, you will no longer need RedNAND, you will have a CIA installer, and you'll be able to launch the Homebrew Launcher from an icon on your home menu. Your device will now automatically launch into CFW SysNAND.

You will no longer be able to boot without the SD card in, that is normal.
You will now boot a Custom Firmware based SysNAND by default.
You can now hold Start on boot to launch Hourglass9, a full featured NAND tool.
You can now hold L on boot to launch the CakesFW configuration menu.
You can now hold Y on boot to launch EmuNAND9, a full featured RedNAND and SD management tool.
You can now hold X on boot to launch Uncart, a tool for converting a physical game cart to an installable file. (in the linked guide, replace Brahma with arm9loaderhax)

You can now update to ShadowNAND, A CFW in the NAND