How to install or reinstall TWiLight Menu

WARNING
When using this with SD cards that are 64GB or above, make sure Save FAT table cache is disabled in the Games/Apps page of TWLMenu++ Settings. Your SD card may become corrupt, due to an issue with saved FAT tables by nds-bootstrap.
If it's already turned off when corruption happened, then it's due to an issue with libfat, or your SD card may be dying.

NOTE for 3DS/2DS users:
If you are coming from TWLoader, uninstall all of the TWLoader applications using a CIA manager (for example, FBI)

Uninstalling or Re-installing

1. In sd:/_nds/ delete TWiLightMenu, nds-bootstrap, and nds-bootstrap.ini.
2. On a Nintendo 3DS Device, delete the TWiLight Menu++ titles using FBI.
3. To re-install, proceed with any of the installation steps below.

Flashcard instructions

1. Download the latest version of TWiLight Menu++ Flashcard from the releases page.
2. In the 7z file, put the _nds folder in the SD Card root.
3. Put the boot.nds file in the SD Card root.
4. Put the roms folder in the SD Card root.
5. DSi/3DS users: Run TWLMenu++ on the console's SD card, and turn on SCFG access in Slot-1. You'll be able to use TWL clock speed and/or VRAM boost on your flashcard games, as well as accessing the console's SD card, as a result.

To run games using your flashcard firmware

1. Extract what's in Flashcart Loader/(your flashcard) to the root of the flashcard's microSD card.

For these flashcards: R4i-SDHC, r4isdhc.com cards, r4isdhc.hk cards, R4i SDHC Upgrade Revolution, R4DSiXL3D, R4i Advance, R4-IIIi, R4 SDHC Revolution, R4(i) Pocket, R4i Gold (v1.4.1) (3DS) & R4xDS, download YSMenu here. Make sure you have YSMenu.nds on the flashcard SD root.

2. After this and setting up TWiLight Menu++ on your flashcard, set Use nds-bootstrap (B4DS) to No, so the flashcard firmware will be used instead of nds-bootstrap.

To autoboot to TWLMenu++

1. Extract what's in Autoboot/(your flashcard) to the root of the flashcard's microSD card. (Skip this, if you don't see your flashcard.)
2. DS Phat/DS lite users: Go to settings in the DS menu, and turn on auto-start, so your flashcard will start on boot.
3. DSi/3DS users: Run TWLMenu++ on the console's SD card, and turn on Auto-start Slot-1.

Installing (DSi)

1. Download the latest version of TWiLight Menu++ DSi from the releases page.
2. In the 7z file, put the _nds folder in the SD Card root.
3. Put the boot.nds file in the SD Card root.
4. Put the roms folder in the SD Card root.
5. (HiyaCFW users) Extract what's in the SDNAND root folder, to the root of your SD card.
6. (Unlaunch users without HiyaCFW) In Unlaunch menu, go to options, and set the No button option to TWLMENUPP (showing boot.nds on the bottom).

Installing (3DS, via Updater)

1. Install the updater here (or with QR code).
2. Launch the updater.
3. Touch Release next to TWL Menu++. Extraction may take a while.
4. Do Step 3 again, but for nds-bootstrap.

Installing (3DS, via Universal-Updater)

1. Setup Universal-Updater for your system (via either installing the 3dsx or cia).
2. Download the NTR/TWL Script. Do so via following the on screen prompts.
3. Go into the list of scripts, select the script you just downloaded and select what you'd like to download.

Installing (3DS, Manual method)

1. Delete the _nds folder from the root of your SD card, if it exists.
2. Download the latest version of TWiLight Menu++ 3DS from the releases page.
3. In the 7z file, put the _nds folder in the SD Card root.
4. Put the boot.nds file in the SD Card root.
5. Put the roms folder in the SD Card root.
6. Put the two CIA files in the SD Card root.
7. On the 3DS/2DS console, install the two CIAs.