Hello everyone!
I have same trouble, but i do one stupid thing when update 3.4 won't install. I do reset... After that i can't register my kindle.
Once I type my login and password and click submit, registration window is just hide and nothing was happens.
I try to unbrick and sucesfull downgrade (with ATK Advanced ToolKit) my kindle to 3.3
It doesn't work.
I check file system MD5:
"error - /etc/uks/pubprodkey01.pem 00cdf09ffae3e6eeb7ad62f0b27fc667 7130ce39bb3596c5067cabb377c7a9ed"
Strange thing is - after that I install usbNetwork hack, get file from another kindle (with right checksum: 00cdf09ffae3e6eeb7ad62f0b27fc667) and replace it, but when I re-run check script and get same error.
So... i don't know what to do, please help me and sorry for my totally lame english.
https://dl.dropbox.com/u/19039103/checkmd5.log
https://dl.dropbox.com/u/19039103/jb_emergency.log
Maybe it help to find out that exactly wrong with my device.