"EPUB on your Kindle? It’s possible! The alternative firmware for Kindle, Duokan, is now available with an english GUI. It is Duokan version 0.5.13.6613 (2010/11/06) for Kindle 2, 3 and DX. You should bear in mind that this version is a beta version. Duokan will install besides the original firmware so you can switch easily between it and the original firmware."
http://flip.netzbeben.de/2010/11/duo...ish-gui-today/
https://www.mobileread.com/forums/sho...d.php?t=105316