Jailbreak it and install KOReader[0], which supports PDFs. You can also install something like Project Title[1] for a fancier UI https://koreader.rocks/ https:

Jailbreak it and install KOReader[0], which supports PDFs. You can also install something like Project Title[1] for a fancier UI https://koreader.rocks/ https://koreader.rocks/ https://github.com/joshuacant/ProjectTitle https://github.com/joshuacant/ProjectTitle