Why does your Kindle even have Bluetooth?
Your Roku TV will restart when the reset is finished. From there, connect it to your Wi-Fi, sign into or create a Roku ...
It uses both connection types. Bluetooth handles pairing and reconnection, while Wi-Fi carries the CarPlay interface, audio, ...
I wrapped my phone in tinfoil.
A 300Mbps speed test does not tell the whole internet story. Latency, congestion, routing, CDNs and fibre depth explain why ...