Warning: This wipes your data. You need a Windows PC or a Mac.
You are now running Android 7.1.2 Nougat. The Play Store will work, YouTube will work (via NewPipe or Revanced), and your tablet is secure for modern Wi-Fi networks.
You need TWRP (Team Win Recovery Project) specifically for the "Clover" (B8000-F).
Why choose this? Android 7.1 still supports 80% of modern apps (YouTube Vanced, Spotify, Lite versions of Facebook). It supports modern TLS certificates so you can browse the web safely.