Step 1: Prepare Your Firestick for Installation

1. Turn on your Firestick and navigate to the Home screen.
2. Go to Settings by selecting the gear icon on the far right of the menu.
3. Scroll down and select My Fire TV.
4. In the menu, choose Developer Options. (If Developer Options is not visible, go to About > Fire TV Stick > Click on the “Fire TV Stick” name 7 times until you see “No need, you are already a developer.” Return to the previous menu, and you’ll see Developer Options appear.)
5. Turn on Apps from Unknown Sources and ADB Debugging.

Step 2: Install the Downloader App

1. Return to the Home screen and navigate to the search icon (magnifying glass) on the top left.
2. Search for Downloader using the on-screen keyboard.
3. Select Downloader from the search results and click Download or Get.
4. Once installed, open the Downloader app.
5. If prompted, allow Downloader to access your files and media.

Step 3: Download and Install Mainstream TV

1. In the Downloader app, click on the URL field.
2. Enter the following code: 294534 and click Go.
3. The app will automatically begin downloading the Mainstream TV APK file.
4. Once the download is complete, click Install.
5. After installation, click Open to launch Mainstream TV.

Step 4: Choose Your Plan

1. Once Mainstream TV is open, you will be prompted to select a plan.
2. Visit Mainstream TV Plans on your phone or computer. https://plans.mainstreamtelevision.com
   
3. Choose the plan that best suits your needs and follow the instructions to complete your subscription.