What "Unknown Apps" Means and Why You'd Install One

An unknown app on Firestick is any app that does not come from the Amazon Appstore — the official store built into your device. Amazon does not carry every streaming service, utility, or media player that exists. If you want to use an app Amazon has rejected, removed, or never listed, you need to sideload it: transfer the app file directly to your Firestick and install it yourself.

The most common reason is to run a streaming service or media player that Amazon has blocked or that competes with Prime Video. Some people also sideload apps to access content from their home network, run older versions of apps, or test software. The process is legal on your own device, but it does bypass Amazon's security checks — which is why the feature is hidden rather than advertised.

Before you start, understand that sideloaded apps do not receive updates the way Appstore apps do. You will need to manually replace the app file each time a new version comes out. You also lose the protection of Amazon's review process, so you are responsible for trusting the source of the app file itself.

Key Takeaways

  • Sideloading requires you to turn on "Unknown Sources" in Firestick settings, which allows installation from outside the Amazon Appstore.
  • You need the app file itself (usually a .apk file) from a source you trust, plus a way to transfer it to your Firestick — either through a USB drive, a file manager app, or a computer on the same network.
  • The process takes about five minutes once you have the app file, but you must manually update sideloaded apps yourself.
  • Sideloaded apps do not appear in your Firestick's main menu by default; you access them through the Apps section or by searching for them by name.

Enable Unknown Sources in Your Firestick Settings

The first step is to allow your Firestick to install apps from outside Amazon's store. This setting is turned off by default. Go to Settings on your Firestick home screen, then select Apps, then Unknown Sources. Toggle it to On. Your Firestick will warn you that apps from unknown sources may pose a security risk — this is Amazon's standard warning, and you can proceed if you trust the source of your app file.

This setting stays on until you turn it off again, so you only need to do it once. If you later decide to disable sideloading, return to the same menu and toggle it back to Off.

Obtain the App File From a Source You Trust

You need the actual app file, which for Android devices (including Firestick) is usually a .apk file. This is not something you can read from a web browser on your Firestick itself — you need to get it on a computer or phone first, then move it to your Firestick.

The safest sources are the app developer's own website or GitHub repository. For example, if you want to sideload VLC media player, you would go to videolan.org, find the Android version, and read the .apk file to your computer. Never read .apk files from random websites or links sent to you — these are common vectors for malware. If the app is on Google Play but not in the Amazon Appstore, you can sometimes extract the .apk from your phone using a file manager app, though this is more technical.

Once you have the .apk file on your computer, you are ready to move it to your Firestick.

Transfer the App File to Your Firestick

You have three main routes: USB drive, network file transfer, or a file manager app on your Firestick. The USB method is simplest if your Firestick model has a USB port (most do, though some newer models do not).

Using a USB drive: Plug a USB drive into your computer, copy the .apk file onto it, then plug the USB drive into your Firestick. On your Firestick, open Settings, go to Storage, and select USB Storage. Your Firestick will show the contents of the USB drive. Find the .apk file and select it to install.

Using a file manager app: Install a free file manager app like Solid Explorer or ES File Explorer from the Amazon Appstore. These apps let you browse your Firestick's file system and install .apk files directly. You can transfer the .apk file to your Firestick over your home network using these apps, or copy it to a USB drive and access it through the file manager.

Using network transfer: If your Firestick and computer are on the same Wi-Fi network, you can use a file manager app to access your computer's shared folders directly. This is faster than USB but requires a bit more setup on your computer side (enabling file sharing). Most file manager apps have a "Network" or "SMB" option for this.

Install the App and Find It on Your Firestick

Once the .apk file is accessible on your Firestick — whether through USB, file manager, or network — select it and tap Install. The installation takes a few seconds to a minute depending on the app size. You will see a confirmation when it is complete.

The app will not automatically appear on your Firestick's home screen. To find it, go to Apps in the main menu, then Your Apps or Library. Scroll down to find the newly installed app — it will be listed alphabetically. You can select it and choose Add to Home Screen if you want it to appear on your main menu for easier access.

You can also search for the app by name using the Firestick's search function. straightforward say the app name into the remote's microphone or type it in the search box.

Update Sideloaded Apps Manually

Unlike Appstore apps, sideloaded apps do not update automatically. When a new version is released, you will need to read the updated .apk file and repeat the installation process. The new version will overwrite the old one, preserving your settings and data in most cases.

To know when updates are available, check the app developer's website or GitHub page periodically, or subscribe to their release notifications if they offer them. Some developers post updates on social media or mailing lists. Set a reminder to check every few months if the app is one you use regularly.

Uninstall a Sideloaded App

Removing a sideloaded app is the same as removing any other app on Firestick. Go to Apps, then Your Apps, find the app you want to remove, and select it. Choose Uninstall. The app and its data will be deleted from your device.

If you want to completely prevent sideloading in the future, return to Settings > Apps > Unknown Sources and toggle it back to Off. This does not remove apps you have already installed, but it prevents new ones from being installed.

Frequently Asked Questions

Will sideloading an app void my Firestick warranty?

No. Amazon does not void your warranty for sideloading apps. However, if a sideloaded app causes a hardware problem, Amazon may not help troubleshoot it. Sideloading itself is not against Amazon's terms for personal use on your own device.

Can I sideload apps on any Firestick model?

Yes, all Firestick models support sideloading. However, older models may be slower to install large apps. If your Firestick model does not have a USB port, you will need to use a file manager app or network transfer instead of the USB method.

What happens if I sideload an app that Amazon later adds to the Appstore?

You can uninstall the sideloaded version and install the Appstore version instead. The Appstore version will then receive automatic updates. Your settings and data may or may not transfer depending on how the app stores them.

Is it safe to sideload apps?

It is as safe as your source. If you read the .apk file directly from the app developer's official website or verified GitHub repository, the risk is very low. If you read from unknown websites or links, you risk malware. Always verify you are on the official website before downloading.

Can I sideload paid apps, or do I need free ones?

You can sideload any app whose developer allows it. Some paid apps are copy-protected and will not run if you sideload them. Others work fine. Check the app's documentation or contact the developer if you are unsure whether their paid version can be sideloaded.