Your books are safely stored in the cloud! All you have to do is log in to your new device and download your books. Subsequently, you can also restore all purchases using the following option: On Android and iOS, in the cloud menu click "Restore purchases from the cloud".
Due to security reasons, it is currently not possible to import any files (books or chess databases) into the app. Books purchases on other devices like Kindle, Nook, etc are not compatible with Forward Chess format.
Currently, it is not possible to import chess databases (PGN, CBH, etc) or other ebooks (PDF, EPUB, etc) inside the app.
No. We couldn’t allow Forward Chess to work on jailbroken iOS devices without violating our contractual obligations.