Update. I got 3.4.2 working on a K2I !!
After some messing around I found out I could modify the "3.3 kindle updater" from the post by @deagol,
https://www.mobileread.com/forums/sh...&postcount=475 to work for 3.4. However the same method did not work for 3.4.2, kept giving a failed flash.
With 3.4 on the K2I I followed the OP instructions about patching "libwebkit" files locally on a PC so I could update to 3.4.2 but I ran into another issue. This post by @aharonium,
https://www.mobileread.com/forums/sh...&postcount=261 , helped me with the "firmware.md5" issue, I just edited the lines involving patching that file out of the 3.4.2 update file Amazon.
Attached is a copy of my edited 3.4 updater and the edited part of the source. You must have a Kindle 3 to generate a 3.4 install file.