3 PORT USB HUB LAN Ethernet connector & OTG adapter for Fire (Gen 2 3 &4)

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.

Ethernet Adapter High Speed 10/100Mbps Micro USB to RJ45 LAN Converter with 3 USB Hub

Lan Ethernet Adapter For Fire Tv 3 Or Stick Gen 2 Or 2 Stop The Buffering Mirco Otg Usb 2.0 Adapter Combo Cable Drop Ship - Pc Hardware Cables & Adapters - AliExpress

USB OTG Cable for Fire Stick 2nd 3nd Gen Ethernet Adapter TV Xstream

Fire TV Stick 4K supports external USB drives and USB peripherals via an OTG cable

3 Port USB Hub LAN Ethernet Connector & OTG Adapter for Fire (Gen 2 3 &4)

Ugreen USB C to Ethernet Adapter – UGREEN

USB Hub with 3 USB Port +LAN Ethernet Adapter for (FIRE Stick 2nd Gen, 3rd Gen 4K, Fire TV Gen 3rd 4K,Fire TV Cube 4K,ROKU Stick,Mobile) - SmarThingx

USB OTG Cable for Fire Stick 2nd 3nd Gen Ethernet Adapter TV Xstream

Micro USB Ethernet Adapter w/OTG Hub