The final step in jailbreaking is an action called ‘side-loading’ software apps. This is a term used for accessing a third-party APK installer file from anyplace other than the Amazon App Store or other “official’ app store.
As detailed in the article above, we side-load apps by using the free Downloader or ES File Explorer. While both Downloader and ES File Explorer can be downloaded for free from the Amazon App Store, none of the third-party apps mentioned in this article can be found there.
The terms “side-load a Fire TV Stick,” “unlock a FireStick,” “to jailbreak a FireStick,” and “to jailbreak a Fire TV Stick” all mean the same thing. The same settings hack is used to jailbreak a Fire TV Cube as when jailbreaking an Amazon Firestick 4K.