How to Install an APK on Quest 3 with SideQuest (2025 Guide)

Last Update on December 25, 2025

The Meta Quest 3 and its younger sibling, the Quest 3S, have revolutionized the world of virtual reality in 2025. With the new Meta Horizon OS, these headsets offer exceptional performance and an impressive library of applications. But did you know that beyond the official Meta Store, an entire ecosystem of experimental apps and games awaits you?

Thanks to SideQuest, the most popular VR sideloading platform, you can install APK files and access thousands of independent games, apps in development, and customization tools. Whether you are a VR developer or simply a curious enthusiast, this 2025 guide explains step-by-step how to unlock the true potential of your Quest 3.

In this comprehensive tutorial, we cover everything: from activating developer mode on the Meta Horizon app to sideloading your first APK file, including troubleshooting common issues like ADB driver errors on Windows 11 and 12. Follow this guide and transform your headset into a limitless VR platform!

Prerequisites: What You Need Before Starting (Quest 3/3S)

Before diving into the fascinating world of APK sideloading, you need to prepare a few essential items. Whether you own a Meta Quest 3 or the newer Quest 3S, the prerequisites remain the same. Here is everything you need to get started smoothly.

Required Hardware

1. Meta Quest 3 or Quest 3S Headset: Both models are compatible with SideQuest and share the same installation procedure.
2. Computer: Windows 10/11/12, macOS (Ventura or higher), or Linux Ubuntu 22.04+.
3. USB-C to USB-C or USB-A Cable: Use a high-quality cable (USB 3.0 minimum) to ensure stable data transfer. The cable provided with your Quest works perfectly.
4. Stable Internet Connection: Necessary to download SideQuest and APK files.

Essential Software

1. Meta Horizon App (formerly Meta Quest): Available on iOS and Android. This app is essential for managing your headset and activating developer mode. Ensure you have the latest 2025 version.
2. SideQuest (Web Installer or Advanced Installer): In 2025, SideQuest offers two installation methods. The Web Installer is recommended for beginners as it automatically configures ADB drivers. The Advanced Installer is suitable for experienced users wanting more control.
3. ADB Drivers (Android Debug Bridge): On Windows 11 and 12, these drivers are sometimes necessary. The SideQuest Web Installer installs them automatically, but we will see how to install them manually if problems arise.

Meta Developer Account (Free)

To activate developer mode on your Quest 3 or 3S, you must create a Meta developer account. Rest assured, it is entirely free and requires no programming skills. You can create this account directly from the Meta Horizon app or on the Meta for Developers portal.

Available Storage Space

Check that your Quest has at least 5 to 10 GB of free space. Some APKs, especially games with OBB files (additional data), can be large. To check your available space, go to Settings > Storage directly on your headset.

Step 1: Activate Developer Mode on the Meta Horizon App

Activating developer mode is the first crucial step to allow APK sideloading on your Quest 3 or Quest 3S. This mode unlocks advanced features and allows your headset to accept applications from external sources. Here is how to proceed in 2025 with the new Meta Horizon OS interface.

Create a Meta Developer Account (if necessary)

1. Access the developer portal: Go to developer.oculus.com from your browser.
2. Log in: Use the same Meta/Facebook account linked to your Quest headset.
3. Create your organization: You will need to create an “organization” (even for personal use). Simply give it your name or a fictional name. This step is instantaneous and requires no validation.
4. Accept the terms: Validate the developer terms. Your account is now active!

Activate Developer Mode via Meta Horizon

1. Open the Meta Horizon app on your smartphone (iOS or Android).
2. Select your headset: Tap the Menu icon (three horizontal bars) then Devices. Select your Quest 3 or Quest 3S from the list.
3. Access developer settings: Scroll down to find the Headset Settings section, then tap Developer Settings (or Developer Mode depending on your version).
4. Enable developer mode: Toggle the switch to On. A confirmation message will appear.
5. Restart your Quest: Completely turn off your headset and then turn it back on. This step is essential for the changes to take effect.

Verify Developer Mode Activation

Once your headset has restarted, put it on and check that developer mode is active:

1. Open the Main Menu of your Quest (Oculus button on the right controller).
2. Go to Settings > System > Developer.
3. If you see a menu with options like “USB Debugging” and “Stay Awake,” developer mode is correctly activated!

Important Note: Developer mode does not void your warranty and does not change the standard features of your Quest. It simply adds the ability to install external applications.

Step 2: Configure SideQuest (Web vs Advanced Installer)

In 2025, SideQuest offers two distinct installation methods: the Web Installer and the Advanced Installer. The choice depends on your technical comfort level and your operating system.

Option 1: Web Installer (Recommended for Beginners)

The Web Installer is the simplest method. It automatically installs SideQuest and configures all necessary drivers, including ADB drivers for Windows 11/12.

1. Access the official site: Go to sidequestvr.com.
2. Download the Web Installer: Click the Download Web Installer button. The downloaded file will be small (about 50 MB) because it downloads the necessary components during installation.
3. Run the installer: Double-click the downloaded file and follow the on-screen instructions. On Windows, you may need to authorize the app via Windows Defender SmartScreen.
4. Automatic driver installation: The installer detects your system and automatically installs ADB drivers if necessary. Wait for the process to finish (2-5 minutes).
5. Launch SideQuest: Once installation is complete, SideQuest launches automatically. The icon will also appear on your desktop or in your Start menu.

Option 2: Advanced Installer (For Experienced Users)

The Advanced Installer offers more control and allows for a portable installation (without system installation). This is the preferred option for developers and advanced users.

1. Download the Advanced Installer: On sidequestvr.com, click Advanced Options then select your operating system (Windows .exe, macOS .dmg, or Linux .AppImage).
2. Manual ADB driver installation (Windows only): If you are using Windows 11 or 12, you may need to manually install ADB drivers. Download them from the official Android site and extract them into a dedicated folder.
3. Install SideQuest: Follow the classic installation procedure according to your OS.
4. Configure ADB path (optional): In SideQuest, go to Settings and specify the path to your ADB folder if you installed it manually.

Connecting your Quest 3 to SideQuest

Regardless of the method chosen, follow these steps to establish the connection:

1. Plug in your Quest: Use your USB-C cable to connect the headset to your computer. Ensure the headset is turned on.
2. Authorize USB debugging: Put on your headset. A pop-up window will appear asking you to authorize USB debugging. Check “Always allow from this computer” and press Allow.
3. Verify connection in SideQuest: Open SideQuest on your computer. In the top left, you should see a green dot or a “Connected” message with your headset’s name. If the dot is red, consult the troubleshooting section below.

Troubleshooting Connection Issues (Windows 11/12)

If SideQuest does not detect your Quest on Windows 11 or 12, the problem usually stems from ADB drivers:

1. Open Device Manager: Search for “Device Manager” in the Start menu.
2. Locate your Quest: Look for an entry named “Quest 3” or “Android Device” with a yellow exclamation mark.
3. Update the driver: Right-click the device > Update driver > Search automatically for drivers. Windows should install the correct driver.
4. Alternative solution: If this doesn’t work, reinstall SideQuest using the Web Installer, which forces driver installation.

Step 3: Sideloading – Installing Your First APK File

Now that SideQuest is configured and your Quest 3 is connected, it’s time to take action: install your first APK file! There are two main methods for sideloading apps onto your headset.

Method 1: Install from the SideQuest Library

SideQuest has a built-in library containing hundreds of free, tested, and secure apps and games. This is the simplest and safest method to start.

1. Explore the library: In SideQuest, click the Store icon in the left menu. You will access a list of apps sorted by categories: Games, Utilities, Apps, etc.
2. Search for an app: Use the search bar or browse categories. For your first test, try “Pavlov Shack” (free VR shooter) or “Tea for God” (narrative experience).
3. View details: Click on the app to see its description, screenshots, user reviews, and compatibility information.
4. Install the app: Click the “Install to Headset” button. SideQuest automatically downloads and installs the APK on your Quest. A progress bar appears at the bottom of the screen.
5. Wait for installation to finish: Depending on the app size and your internet connection, this can take from 30 seconds to several minutes. A confirmation message appears once the installation is complete.

Method 2: Install a Custom APK (Downloaded File)

If you have downloaded an APK file from an external source (forums, independent developer sites, etc.), you can install it manually via SideQuest.

⚠️ Security Warning: Only install APKs from trusted sources. Malicious APK files can compromise your headset or your data. Prioritize APKs hosted on recognized platforms like Itch.io, GitHub (for open-source projects), or shared by verified developers.

1. Download the APK file: Save the APK file on your computer in an easy-to-access location (Desktop, Downloads, etc.).
2. Open SideQuest: Ensure your Quest is still connected (green dot visible).
3. Drag and drop the APK: Simply drag the APK file from your file explorer into the SideQuest window. Alternatively, click the “Install APK file” icon (folder with an arrow) in the top toolbar, then select your file.
4. Confirm installation: A confirmation window appears. Click “Install”. SideQuest transfers and installs the APK on your headset.
5. Wait for the success message: You will see an “APK installed successfully” message once the process is complete. If you see an error, consult the troubleshooting section below.

Installing Games with OBB Files

Some large games use OBB files (additional data files) in addition to the main APK. Here is how to handle them:

1. Install the APK first: Follow the normal procedure to install the APK file.
2. Transfer the OBB folder: In SideQuest, click the “File Browser” icon. Navigate to /sdcard/Android/obb/.
3. Create a folder: Create a new folder named after the app’s package name (usually provided with the OBB file, e.g., com.developer.gamename).
4. Upload the OBB file: Drag and drop the OBB file into this folder. Transfer can take several minutes for large files.
5. Launch the game: Once the transfer is complete, launch the game from your Quest. It should now detect the OBB files.

Difference Between App Lab and Pure Sideloading

It is important to understand the distinction between two often-confused concepts:

• App Lab: This is a “hidden” section of the official Meta Store where developers can publish apps without going through the full approval process. App Lab apps are secure, automatically updated, and accessible via a direct link. You install them like any other app from the Store.
• Pure Sideloading: Installation of APKs from completely external sources (outside Meta Store and App Lab). These apps do not benefit from automatic updates and must be reinstalled manually for each new version.

SideQuest allows you to do both: browse App Lab apps and install external APKs.

Step 4: Launching Applications via ‘Unknown Sources’

Once your APKs are installed, it’s time to launch them! Unlike Meta Store apps that appear directly in your main library, sideloaded apps are found in a special section called “Unknown Sources”.

Accessing the Unknown Sources Section

1. Put on your Quest 3 or Quest 3S headset.
2. Open the App Library: Press the Oculus (Meta) button on your right controller to open the main menu.
3. Go to “Apps”: Click the Apps icon (grid of squares) in the bottom bar.
4. Filter by “Unknown Sources”: In the top right of the Applications screen, you will see a dropdown menu displaying “All” by default. Click it and select “Unknown Sources”.
5. View your sideloaded apps: All apps installed via SideQuest appear here with their icons (if available).

Launching Your First Sideloaded App

1. Select the app: Click the icon of the app you want to launch.
2. Accept permissions: On the first launch, some apps may request permissions (access to files, microphone, etc.). Read carefully and grant the necessary permissions.
3. Enjoy the experience: The app launches like any other VR app. Use your controllers to interact normally.

Organizing Your Sideloaded Apps

In 2025, Meta Horizon OS allows for better app organization:

• Create folders: In the Apps section, you can create custom folders (e.g., “SideQuest Games”, “Experimental Apps”) and drag your apps into them.
• Pin favorites: Long-press an app icon and select “Pin” to add it to your quick menu.
• Hide unused apps: You can also hide apps without uninstalling them via the context menu (long-press on the icon).

Managing App Permissions

Some sideloaded apps may request sensitive permissions. Here is how to manage them:

1. Open Settings: Meta Menu > Settings > Privacy and Security.
2. App Permissions: Select “App Permissions”.
3. Modify permissions: Browse the list of your apps and adjust permissions individually (Microphone, Camera, Storage, etc.).

Security Tip: Only grant permissions strictly necessary for the app’s operation. If a simple game asks for access to your contacts, it’s suspicious!

Troubleshooting: Common SideQuest Errors in 2025

Even following this guide to the letter, you might encounter some issues. Here are the most common errors and their detailed solutions.

Error 1: SideQuest Does Not Detect My Quest (Red Dot)

Possible Causes:

• Missing or outdated ADB drivers (Windows 11/12)
• USB debugging authorization not granted
• Defective USB cable or problematic USB port
• Developer mode disabled

Solutions:

1. Check USB authorization: Put on your headset and check that no authorization request is pending. If you accidentally refused, go to Settings > Developer > Revoke USB Authorizations, then reconnect.
2. Test another cable/port: Try a different USB port (prioritize USB 3.0 ports directly on the motherboard). Test with another cable if possible.
3. Reinstall ADB drivers (Windows): Open SideQuest > Settings > Reinstall Mobile Device Drivers. Restart your computer after installation.
4. Re-enable developer mode: Disable and re-enable developer mode in the Meta Horizon app, then restart your headset.

Error 2: “Installation failed” When Installing an APK

Possible Causes:

• Corrupted or incompatible APK
• Insufficient storage space
• Conflict with an existing version
• APK designed for a different architecture (ARM vs ARM64)

Solutions:

1. Check available space: On your Quest, go to Settings > Storage. Free up at least 2 GB of space.
2. Uninstall old version: If you are updating an app, uninstall the old version first via SideQuest (“Currently Installed Apps” section).
3. Check compatibility: Ensure the APK is compatible with Quest 3/3S. Quest 2 APKs generally work, but not always.
4. Redownload the APK: The file might have been corrupted. Download it again from the original source.

Error 3: The App Launches but Crashes Immediately

Possible Causes:

• Missing OBB files
• Permissions denied
• App incompatible with Meta Horizon OS 2025
• Outdated app version

Solutions:

1. Check OBB files: If the game requires OBB files, ensure they are correctly installed in /sdcard/Android/obb/package.name/.
2. Grant all permissions: Go to Settings > Apps > Unknown Sources > [App Name] > Permissions, and enable all requested permissions.
3. Check logs: In SideQuest, go to the “Run ADB Commands” tab and type adb logcat to see system logs. Look for error messages related to your app.
4. Look for an updated version: The app might be outdated. Check if a newer version compatible with 2025 exists.

Error 4: “INSTALL_FAILED_UPDATE_INCOMPATIBLE”

This error occurs when you try to install an APK with the same package name as an already installed app, but with a different signature.

Solution:

1. Completely uninstall the old version of the application.
2. In SideQuest, go to “Currently Installed Apps”, find the problematic app, and click the trash icon.
3. Then reinstall the new version of the APK.

Error 5: Apps Do Not Appear in “Unknown Sources”

Possible Causes:

• The application is actually a 2D Android app (non-VR)
• Temporary system bug
• Incomplete installation

Solutions:

1. Restart your headset: A simple restart often solves this problem.
2. Check via SideQuest: In SideQuest, “Currently Installed Apps” section, verify that the app appears in the list.
3. 2D Apps: If it’s a 2D Android app, it might appear in a different menu or require a special Android launcher like “Oculus TV” or “Virtual Desktop”.

Security and Risks: What You Need to Know in 2025

Sideloading often raises legitimate concerns regarding security and ban risks. Let’s clarify things once and for all with up-to-date information for 2025.

Is Sideloading Legal on Quest 3?

Yes, sideloading is perfectly legal. Meta (formerly Facebook/Oculus) officially allows developer mode and app sideloading. It is even encouraged for developers testing their creations.

Developer mode exists specifically to allow the installation of apps in development. Platforms like SideQuest have existed since 2019 and have never been contested by Meta.

Can You Be Banned for Using SideQuest?

No, using SideQuest itself cannot get you banned. Since the platform’s launch, no documented cases of banning related to using SideQuest have been reported.

However, certain activities can violate Meta’s Terms of Service:

• Piracy of paid games: Installing cracked APKs of normally paid games is illegal and can lead to a ban.
• Online cheating: Using mods or hacks in multiplayer games to gain an unfair advantage violates rules and can lead to sanctions.
• Illegal content: Installing apps containing illegal content (according to your country’s laws) is obviously problematic.

Advice: Use SideQuest only to install legitimate apps, free games, developer demos, and customization tools, and you will have no problems.

How to Ensure Your APKs Are Safe?

Not all APKs are created equal. Here is how to ensure your files are safe:

1. Prioritize the SideQuest library: Apps available directly in SideQuest are verified by the team. This is the safest source.
2. Trusted Sources: For external APKs, only download from:
   • Itch.io: Platform for independent developers
   • GitHub: For open-source projects
   • Official developer websites
   • App Lab (via a direct Meta link)
3. Avoid shady download sites: Sites offering “cracked” versions of paid games often host malware.
4. Check permissions: If a simple video player app asks for access to your contacts, it’s suspicious.
5. Read reviews: On SideQuest, always check user comments before installing an unknown app.

Privacy Management

In 2025, Meta strengthened privacy options on Quest 3 and Quest 3S. Here is how to protect your data:

• Limit data sharing: Settings > Privacy > Data Sharing. Disable automatic sharing with third-party apps.
• Control permissions: Regularly review permissions granted to your sideloaded apps (see previous section).
• Use a secondary account: To test experimental apps, some users create a secondary Meta account dedicated to sideloading.

Going Further: Advanced Tips for Quest 3 and Quest 3S

Once you master the basics of sideloading, here are some advanced tips to fully exploit your Quest 3 or Quest 3S in 2025.

Install SideQuest Without a PC (via Android Smartphone)

Since 2024, it has been possible to install APKs directly from a compatible Android smartphone, without using a computer!

Prerequisites:

• Android smartphone with USB-C port (Android 10 minimum)
• USB-C to USB-C cable
• “Bugjaeger” app (available on Google Play Store)

Quick Procedure:

1. Install Bugjaeger on your Android smartphone.
2. Activate developer mode on your Quest (as explained previously).
3. Connect your Quest to your smartphone via USB-C.
4. Authorize USB debugging on your Quest.
5. In Bugjaeger, navigate to your APK file and install it.

This method is perfect for traveling or if you don’t have access to a computer!

Optimize Performance with Quest Games Optimizer

Quest Games Optimizer (QGO) is a tool available via SideQuest that allows you to adjust the graphic settings of your games to improve performance or visual quality.

Installation:

1. In SideQuest, search for “Quest Games Optimizer”.
2. Install the app on your Quest.
3. Launch QGO from Unknown Sources.

Usage:

• Increase rendering resolution: For a sharper image (caution, impact on performance).
• Change refresh rate: Switch from 72Hz to 90Hz or 120Hz depending on the game.
• Adjust detail level: Find the right balance between beauty and fluidity.

Updating an APK Installed via SideQuest

Sideloaded apps do not update automatically. Here is how to proceed:

1. Check if an update exists: On the developer’s site or in SideQuest (some apps display “Update Available”).
2. Two options:
   • Option A (Recommended): Install the new version over the old one. If the signatures match, your saves will be preserved.
   • Option B: Uninstall the old version, then install the new one (you will lose your saves).
3. Back up your data: Before any update, use SideQuest’s File Manager to copy the app’s save folder (usually in /sdcard/Android/data/package.name/).

Best Legal APKs to Test Immediately (2025)

Here is a selection of free and legal apps available on SideQuest to start your adventure:

• Pavlov Shack: Tactical multiplayer shooter (Counter-Strike VR type)
• Tea for God: Narrative experience and exploration with redirected walking locomotion
• Ancient Dungeon VR: Very addictive VR roguelike
• Gorilla Tag: Hilarious multiplayer game where you are a gorilla
• Deisim: God simulator, create and manage your civilization
• BMBF: Tool for modding Beat Saber (adding custom songs)
• Virtual Desktop Streamer: Stream PC VR games wirelessly (full version paid on the Store)

FAQ: Frequently Asked Questions About Quest 3 Sideloading

Is sideloading legal on Quest 3?

Yes, sideloading is completely legal and officially supported by Meta via developer mode. You can install development apps, demos, and independent games without any issues. Just avoid installing pirated versions of paid games, which is illegal.

Can you be banned for using SideQuest?

No, using SideQuest cannot lead to a ban. Since its launch in 2019, no user has been banned for simply installing SideQuest or legitimate apps. Bans only occur in cases of piracy, online cheating, or violation of Meta’s Terms of Service.

How do I update an APK installed via SideQuest?

Sideloaded APKs do not update automatically. To update an app, download the new version of the APK and install it over the old one via SideQuest. If the signatures match, your data and saves will be preserved. Otherwise, you will need to uninstall the old version before installing the new one.

Does SideQuest work on the new Quest 3S?

Yes, SideQuest works perfectly on the Meta Quest 3S. The installation procedure is identical to that of the Quest 3. Both headsets share the same Meta Horizon OS system and are therefore fully compatible with all SideQuest features in 2025.

Can I install Quest 2 games on my Quest 3?

Yes, in the vast majority of cases. The Quest 3 and Quest 3S are backward compatible with Quest 2 apps. However, some very old or poorly optimized games may encounter issues. Always check the comments on SideQuest before installing.

Do I lose my warranty by using developer mode?

No, activating developer mode does not void your warranty. It is an official Meta feature. However, if you modify the system aggressively (root, custom firmware, etc.), it could affect the warranty. Simple APK sideloading via SideQuest poses no problem.

Conclusion: Unlock Your Quest 3’s Potential with SideQuest

You are now equipped with all the knowledge necessary to install APKs on your Meta Quest 3 or Quest 3S via SideQuest in 2025. From developer mode to OBB files, and troubleshooting ADB errors on Windows 11/12, you now have all the keys to unlock a limitless VR universe.

Sideloading transforms your VR headset into a truly open platform, giving you access to hundreds of independent games, experimental apps, and customization tools that you will never find on the official Meta Store. It’s an opportunity to discover gems created by passionate developers from around the world.

Key points to remember:

• Sideloading is legal, safe, and does not jeopardize your warranty
• SideQuest is the leading platform, easy to use even for beginners
• Always prioritize trusted sources for downloading your APKs
• The SideQuest Web Installer significantly simplifies installation in 2025
• Quest 3 and Quest 3S share the same procedure and compatibility

Don’t hesitate to explore the SideQuest library, test demos of games in development, and support independent creators in the VR community. The sideloading ecosystem is rich, dynamic, and constantly evolving.

If you encounter difficulties, refer to our troubleshooting section or consult the SideQuest community on Discord and Reddit, always ready to help newcomers. Happy sideloading and fully enjoy your extended VR experience!