Of course, download the panda book permanently and free of charge, and then transfer the text files such as TXT on the computer to the mobile phone under the WIFI environment (use the panda reading software on the mobile phone, which has instructions, and you can use the mobile phone to transfer it by entering the address in the computer browser), and then open the book with the panda. You don't have to jailbreak, download it on itunes, and use software like IBOOK, which is very convenient. That's what I've always seen. I didn't spend a penny

I suggest you try upstairs.