Step 2: Enable installing apps from unknown sources
The next part is where we get serious: enabling downloads of apps from unknown sources. By ‘unknown sources’, the Fire TV simply means any apps that are not from the Amazon Appstore.
This is an important security feature, but it needs to be disabled before you can install OverBox IPTV, as it’s not available direct from Amazon.
Select the nav tabs from the home screen by pressing up, and scroll right to reach Settings. From this menu, select Device. Next, pick Developer Options and you should see a sub-menu that includes the entry ‘Apps from Unknown Sources’. Select it, making sure it reads ON underneath.