Why can't the smart bookcase return the books A: The reason why the books can't be returned is the system failure. It is recommended to find the bar code posted on the book (not the bar code on the back of the book, don't confuse it! ), aim at the information to scan. After the scanning is successful, put the books into the corresponding book warehouse, that is, return them successfully. If you choose to borrow books. You need to find the book you want to borrow first, and remember the warehouse number; Slide the screen of the smart bookcase to find the book you want to borrow or the corresponding warehouse number; Pick up the books from the storage room after you confirm the borrowing!