Originally Posted by user_none
Bookeen's firmware (I don't know about Pocketbook's) is Linux. The application they use that displays the ebook is proprietary. Bookeen (due to the requirements of the GPL) makes the source for their firmware minus this application available. If someone really wanted they could take the Linux source and make their own compatible firmware. Another application could be used in place of Bookeen's or Adobe's (The new ePub firmware will be using this) reader application. The Jetbook supports FBReader for instance.
Guess the tricky part would be the install / update proses, switching beween the two firwares... But getting rid of pages number might be worth the pain.
I think part of the code, ie menus and all, is bookeen proprietary. It would be basicly doing firmware from scratch.