This is an old thread. The newer stuff is here:
https://www.mobileread.com/forums/sho...03#post1868403
Different kindles seem to have different root passwords. In at least two cases, root password is mario. In another reported case it was fionaXXXX as reported by Sir Alex's KDT program. In some cases, it might be fionaXXX (same as KDT but without last character)...