How to "jailbreak " an Amazon Fire Stick

My fire devices from about a year ago (not the latest versions) don’t need to be jail broken and can freely sideload apps, no play store required. I guess it’s either the first gen and newest devices that give people a hard time.

The apps remain, no disappearing apps. No issues. Even installed NORDVPN to my devices. Kodi, mobdro, tvzion, you name it…