Selectivly Deleting free books From Kobo reader
I have found the latest version of Calibre (version 7.5.4) will delete any of the "100 free" books. Calibre recognizes when the device is connected and will show all the books on the reader when you select the reader Icon at the top of the program. Is shows the 100 free books. just delete the ones you don't want. It's that simple.