perhaps if you spent more time reading what the OP asked and less time attacking anyone else who dares to try to help...
post #1 "Is there any way to remove the cover(s) embedded in all the e-books file (azw3, mobi, epub)...."
so I gave a simple work-around for epub.
and yes, calibre does not embed a new cover on "send to device" but it does send separate .jpg cover images to some devices, which the OP wants to NOT have sent ....
I have a solution for azw3 but as you will most likely rip it to shreds just because it's not your idea , I'll not post it....
.... leaving the thread now.. you can have it all to yourself.
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