If you already own the base CIA of Mario & Luigi: Bowser’s Inside Story + Bowser Jr’s Journey on your Nintendo 3DS, the version 1.1 update is the small but meaningful patch that brings your copy up to date. This page covers the EUR and USA update files, what the patch changes, and how to apply it using standard custom firmware tools. The download is a 29MB CIA package, and you can install it alongside your existing game without touching your save data.

What This Update Actually Changes

Version 1.1 is a maintenance patch, not a content expansion. Nintendo released it shortly after the January 25, 2019 launch to address stability issues reported in the initial release. The patch focuses on smoothing out the experience rather than adding new modes, characters, or story chapters. If you have played through the opening hours of the base game and noticed occasional hiccups during battles or transitions, this update is the intended fix.

The update applies to both the EUR and USA regions, and each file is 29MB. Because the patch is region-specific, you need to match the update to the region of your base game CIA. Installing a USA update on a EUR base game, or the reverse, will not work correctly. The download section below separates the two regions so you can grab the right one.

Technical Specifications

Key Features of the 1.1 Patch

• Stability improvements: The patch targets crash and freeze scenarios that some players encountered during extended play sessions.
• Battle flow refinements: Minor adjustments help the turn-based combat and Bros. Attacks run more smoothly, particularly in later-game encounters.
• Region-matched files: Separate EUR and USA CIA packages so you can install the correct update for your base game.
• Save data compatibility: Applying the update does not erase your progress; existing saves remain intact after installation.
• Small footprint: At 29MB, the update downloads quickly and takes minimal space on your SD card.

Pros & Cons

• Pros:
  • Fixes known stability issues from the launch version.
  • Tiny 29MB download that installs in seconds.
  • Works with both EUR and USA base games when matched correctly.
  • No impact on existing save files.
• Cons:
  • No new story content, characters, or modes.
  • Requires the base game CIA to be useful.
  • Region matching is mandatory; the wrong file won’t apply.
  • Installation requires custom firmware and a CIA installer.

Who This Update Is For

This patch is aimed at players who already have the base CIA of Mario & Luigi: Bowser’s Inside Story + Bowser Jr’s Journey installed on a 3DS running custom firmware. If you are starting fresh, you need the base game first — the update alone will not launch. Once the base game is in place, applying 1.1 brings your copy in line with the current release and resolves the issues the patch was designed to address.

If you enjoy Mario role-playing games and want more after finishing this one, you can explore similar titles like Paper Mario: Super Seal or Hello, Luigi! Switch NSP for a different take on the characters.

Download Links: EUR and USA

Choose the update that matches your base game region. Both files are 29MB.

EUR Update 1.1 (29MB): TusFiles | ZippyShare | UptoBox | 1Fichier

USA Update 1.1 (29MB): MegaUp | TusFiles | ZippyShare | 1Fichier

Need the base game? You can find the M&L: BIS + Bowser Jr’s Journey (EUR) CIA on the linked page.

Installation Guidance for CIA Files

Installing a CIA update on a 3DS with custom firmware follows the same pattern as installing any CIA package. You place the .cia file on your SD card, then use a CIA installer to install it. The input notes recommend DevMenu or BigBlueMenu, and FBI is also a common choice. Make sure the file is placed properly on your SD card before you open the installer.

One practical point: install the update after the base game, not before. If you install the update first, the system may not recognize it as belonging to an existing title. Also confirm that your base game region matches the update region — EUR with EUR, USA with USA. If you run into a damaged RAR or a CRC error during extraction, re-download the file rather than trying to repair it. The notes also mention updating your extraction software, since older versions can prompt for passwords that don’t exist.

For extracting the downloaded archive, use WinRAR or 7zip. There is no password on the game files.

Version Freshness and Publisher Details

The 1.1 update was released in early 2019, shortly after the game’s January 25, 2019 launch. It represents the current patch level for this title on 3DS. The base game was developed and published by Nintendo, and the update file listed here is distributed as a CIA package. The developer field in the metadata lists Berry, which reflects the uploader/source of this file rather than the original game studio.

Because this is a patch for a discontinued platform, there are no further updates expected beyond 1.1. What you see here is the final state of the game’s patch history. If you are setting up a 3DS for the first time, install the base game and then apply this update to get the most stable version available.

Notes and Troubleshooting

• You need the base game installed for this update to be useful.
• Match the region: EUR update for EUR base, USA update for USA base.
• If a RAR file reports damage or a CRC error, re-download it.
• There is no password on any game files uploaded here.
• For broken or dead links, use the reupload request page.
• Decrypted ROMs are playable on PC with the Citra 3DS Emulator.

If you like this game, support the developers by purchasing a legitimate copy where available.

Related Downloads

Looking for more Mario titles? Check out New Super Mario Bros WII U ISO ESHOP (NDSU) (Loadiine) (USA) for a different platform and play style.

Frequently Asked Questions & Setup Guide