This updates /opt/usr/java/lib/security/cacerts [1]. On Kindles old enough that Amazon has long stopped doing feature or non-critical bug updates, that's all this update updates.<p>[1] <a href="http://www.mobileread.com/forums/showthread.php?p=3254035#post3254035" rel="nofollow">http://www.mobileread.com/forums/showthread.php?p=3254035#po...</a>