Hey @Aroth, I sent it tuesday, and it shoudl be getting to you soon.
This is a reminder that board comes set to 3.3v.
While I would not recommend you use it in that configuration on
your kindle, I will tell you that
my kindle has been tolerant of 3.3v. I make no guarantees that you will not burn out the serial port if you leave it set to that.
The instructions on how to change it are here again ( and probably in the first post of this thread, along with the place to get 1.8v power ):
http://jim.sh/ftx/#jumper-configuration