If the fire 8 has a micro usb port, then there are 3 possibilities for an adapter. My Fire HDX 8.9 4th gen uses the "slim" micro usb like that on the Nexus 7 2013 for a micro usb to hdmi; think that it is a 6-pin micro usb. Another type of "standard" micro usb is the 5-pin port which require a different hdmi adapter. Then again the Samsung Tab Pro uses an 11-pin micro to hdmi adapter.
The "trick" is to find out what kind of pin config the Fire 8 needs or what the Fire 5th gen has evolved to use for connection to an hdmi. Doesn't matter as far as battery charging is concerned but the hdmi adapter may need to have a connection to a charger for more "power" for more oomph as needed by the tablet.
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