Easiest First: Remove the Power Cable from the Fire TV Box. Power the Fire TV Box back on. This will usually correct the issue of the Fire TV Box connecting to the internet over Ethernet.
USB OTG Cable HUB LAN Ethernet Adapter for TV Stick 4K Cube/Max/Lite, Alexa Show 2nd Gen, Show 5 and Show 8
This Ethernet Adapter w/ USB Hub for the Fire TV 3 and Fire TV Stick 2 is cheaper and better than 's official adapter
UGREEN USB 3.0 Hub Ethernet Adapter 10 100 1000 Gigabit Network Converter with 3 USB 3.0 Ports Hub Compatible with Laptop PC Nintendo Switch MacBook Mac Mini Surface XPS Windows Linux macOS, and More : Electronics
USB OTG Cable for Fire Stick 2nd 3nd Gen Ethernet Adapter TV Xstream
3 PORT HUB Ethernet Adapter OTG CABLE for 4K FIRESTICK OR 2nd Gen FIRE
Plugable USB-C 7-in-1 Hub with Ethernet – Plugable Technologies
Wired Ethernet adapter on a Fire TV Stick
Specifications:, TV Stream Ethernet USB HUB adds three additional USB ports to your device, which are USB flash disk, USB wireless mouse, USB wireless
Deyuer 3 Ports USB HUB LAN Ethernet Connector OTG Adapter for Fire Gen 2/3/4
Buy USB Cables, Hubs & Adapters at Kogan, Australia's premier online shopping destination. Shop amazing deals on a huge range of Computer Cables
3 Ports USB HUB LAN Ethernet Connector OTG Adapter for Fire Gen 2/3/4 - Grey | USB Cables, Hubs & Adapters | Laptops & Computers
Micro 3 Port USB HUB Ethernet adapter for firestick 4K or 2nd Gen
TV Xstream LAN Ethernet Adapter with 3 USB Port Hub for TV Streaming Devices - S