First: Enable Third-Party Apps in Settings
In order to install apps from outside Amazon’s Appstore—a process known as “sideloading”
—you’ll need to enable a setting first. Go to the Fire TV home page, then navigate all the way to the Settings tab on the far right. Highlight “Device,” then “Developer Options.”
Highlight “Apps from Unknown Sources,” then press the center button. Select “Turn on” on the warning screen. That’s it—you’re ready to install apps from outside the Amazon Appstore.
Now you’ll just have to find the apps you want, in the form of APK installers. You have a few options for doing so: you can load them from your Android phone, browse the web from your Fire TV. If you haven't downloaded TV360 on your Android phone, go to Option Two.
Option One: Load Apps From Your Android Phone
The fastest and simplest way to get an app over to your Fire TV, without having to use third-party apps or any tedious TV remote typing, is to use an Android phone (if you have one). The Apps2Fire app on the Play Store allows you to transfer any app that’s already installed on your phone over to the set-top box. So download the app, then make sure that your phone is on the same Wi-Fi network as your Fire TV device. You’ll also need to make sure that “ADB Debugging” is enabled in the Settings > Device > Developer Options screen on the Fire TV.
Open the app on your phone, then tap the three-dot button in the upper-right corner and select “Setup.” In this screen, tap “Network.” Wait for the scan to complete, and you’ll see all the devices connected to your local network, identified by their IP address and device name.
In this case, the device labelled “amazon-c630d5b29” is obviously my Fire TV. If you can’t tell which one is the right device, use the Fire TV remote to navigate to Settings > Device > About > Network. The IP address is in the display on the right. Tap the correct device, then select “local apps” from the tabs at the top of the screen.
From this list, you can tap any of the apps on your phone, then “Install,” and it will be sent over the network to your Fire TV. You don’t even need to do anything on the TV, it will install itself in the background and appear on your home screen automatically.
In this case, the device labelled “amazon-c630d5b29” is Fire TV. If you can’t tell which one is the right device, use the Fire TV remote to navigate to Settings > Device > About > Network. The IP address is in the display on the right. Tap the correct device, then select “local apps” from the tabs at the top of the screen.
Option Two: Download Apps From the Web on Your Fire TV
If you don’t have an Android phone, you can download apps manually to your Fire TV from the web. Go back through the Settings menu until you get to the Fire TV home page. Then, using either the Search tool on the far left or the Alexa voice search button on your remote, search for “Downloader.” Highlight the result below to get to the app page on the Amazon Appstore.
This little app exists for one reason: to download other apps. It’s a barebones browser that will let you navigate to any site on the web and download APK files, then automatically open the installer window. Navigation is either direct to a download address from the home page, or with the browser on the side menu. You can use the remote to move the cursor and the on-screen keyboard type tv360.info or https://www.tv360.info.
You can find Android APKs anywhere, but be wary of sites you don’t know, We recommend using APK Mirror. It’s a highly trustworthy source that only accepts verified apps that have been scanned for modifications, and only hosts freely-available stuff, so there’s no piracy involved. (Full Disclosure: I used to work for the owner of APK Mirror.)
Once you’ve selected the TV360 apk, the Downloader app will automatically begin the installation process. Highlight and select “Install” to start, then “Done” to finish. Your TV360 app will appear on the home page and under “Apps.”