I've got a default eBook reader installed onto my Next7p Android tablet and there were eBooks (in epub format) already preloaded into it. They're in a folder titled "25 Free book - Prealoded on Next7" and I wasn't the one to make the typo. I'm not going to read 90% of the books installed, so I'd like to get rid of or exchange them for other books. Can I delete any of the files and copy over new epub files into the folder, as long as I keep the number of ebooks in the folder at 25? Edit) I'm actually afraid of trying, in case something goes wrong.