How recover my unlock code?
If you lost the unlock code you have bought on this website, you can recover it using the code recovery form.
If you want to transfer your book to a new device, follow the topic related in this help.
If you have already used once your unlock code, you can not use it a second time to unlock your book edition. The book activation is stored in your store account (Google Play or Apple iTunes). If your content is back to its locked state, you have to restore your purchase. To do this, you have to follow the topic related.