My house has Cat6 cabling and Ubiquiti UniFi AP AC LITE Access Points on every floor. I was able to use Wi-Fi on my Fire TV Stick 4K. However, my philosophy is this: if the device isn't moving, use Ethernet, not Wi-Fi. The adapter works great with the Fire TV Stick 4K and is easy to set up. I gave up using a separate USB power adapter and just plugged the USB-A end directly into the TV. No problem.
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