Unless you’re a developer or like having things not work, you shouldn’t install this first version of Fire OS 5. There’s a good reason why you have to jump through a few hoops to install the developer preview of Fire OS 5. It has issues, is not ready for the masses, and is just down right weird at times.
For starters, ADB on Fire OS 5 is unstable, so you likely won’t be able to sideload apps with it. Before you grab your pitch fork and yell “OH NOEZ!! AMAZON HAS BLOCKED SIDELOADING!!1!1!!”, know that that is not the case and will never be the case. There’s just something buggy with Fire OS 5 and its network connection. For some odd reasons, Fire TV’s running this first version of Fire OS 5 are actually creating a wifi hotspot. Perhaps it’s some new way to setup the device by connecting to it through an app, like the way one sets up the Amazon Echo through it’s own wifi hotspot. I don’t know, but I think it’s related to why ADB doesn’t quite work right.
There are also several key apps that don’t run the same as with Fire OS 3. Most notably, Firestarter, the beloved sideload launcher, does not work correctly with Fire OS 5. Llama is another app that doesn’t behave the same.
The good news is, now that the OS is available, developers can start testing their apps and figuring out if they need to update their app or if there’s something broken on Amazon’s side of things. By the time Fire OS 5 is officially released to all Fire TVs, we’ll hopefully have a stable platform to carry the Fire TV forward. If you’ve installed Fire OS 5 and have found something broken, post about it in the comments below.