1️⃣ Using a Google-certified Android TV OS (such as Sony or NVIDIA Shield)

Devices running Google-certified Android TV OS (e.g. Sony, NVIDIA Shield) manage app installation permissions like Android phones. 

Go to: 【Settings】 → 【Security & restrictions】 → Enable “Unknown sources” for apps like File Manager or Downloader.

2️⃣ Built-in file manager cannot install APK directly

If the built-in file manager can't trigger the installation prompt when opening an APK file

Solution: Go to settings and enable “Unknown sources” for the file manager app.

3️⃣ Installing APK via Downloader by AFTVnews

When using Downloader by AFTVnews: 

• Fire TV devices require manual permission for unknown sources 

• Most Android TV Boxes allow it by default, but if installation fails, check the permission under 【Settings】 → 【Install unknown apps】 → enable for “Downloader”

📝 SUMMARY:

🟢 Most Chinese-brand Android TV Boxes: usually pre-authorized for APK installations

🔵 Google-certified Android TV OS & Fire TV: require manual permission for unknown sources

⚠️ If installation fails, check the settings as needed—no need to unlock everything upfront.

• Your TV Box is connected to the internet

• You have the APK file stored on a phone, computer, or USB drive

• Your TV Box has access to Downloader or a built-in file manager

• Use your remote to go to 【Settings 】→ 【Security & restrictions】 (or similar wording)

• Find “Unknown sources” and enable it for the app you’ll use to install the APK (e.g. Downloader or File Manager)

• If a warning pops up, press “OK” to confirm

Method A: Using USB or network transfer

• Copy the APK file to a USB flash drive

• Insert the USB into your TV Box

• Use the built-in or third-party File Manager to navigate to the USB folder and click the APK file to install

Method B: Using Downloader

• 「Downloader by AFTVnews」 Install and open “Downloader by AFTVnews”

• Switch to the “Browser” tab, enter the APK download link in the address bar → press “Go”

• Once downloaded, the system will automatically prompt the install screen

You can install this convenient app "Downloader by AFTVnews" from Google Play Store.

You will be asked to grant file access. Select Allow.
(If you accidentally selected Deny, then you need to go to Settings > Applications > Manage Installed Applications > Downloader > Permissions to set Storage to Allow.)

Please enter the download link we provided in the main screen or the "Browser" tab of the Downloader by AFTVnews app.

Enter the following URL to get the app
For Android 32-bit iSakura (Old version) 

For Android 64-bit  IKIKU TV (New version)

• When the install prompt appears, press “Install”

• Wait for the progress bar to complete → choose “Done” or “Open” when finished

After installing the IKIKU TV / iSakura TV APK, tap the icon and log in as shown.

Please use your remote control to select "Personal Info."
> Two buttons will appear—press the right-side button labeled "Login."
> Then, enter your account and password, and press "Login" again to continue.

Once you’ve successfully logged in, sit back and enjoy your TV experience!

Installation failed : Ensure “Allow from this source” is turned on

Can’t download the APK : Check your internet connection or try another browser