that is strange - there is a "devices" subforum in calibre forum which would be the best place ask for more help. ( but see below first)
calibre companion is an app that should work with all kindle fire devices. there is a free demo version in amazon store so costs you nothing to test it & it has its own help forum
you say it appears in windows explorer so can you open it and browse folders ( which is what calibre will need to do )
sometimes these tablets & phones connect in one of two ways. as a storage device or as a media player. you need the former, and maybe you have to flip a connection setting in the fire for that. I had to in my wife's nexus phone for example. But amazon should have known that ? what version of windows do you have?. there may be a issue getting it to connect to windows XP
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