Fire Tablet AD removal starts with the proper files HERE
The files are to be ran from Windows shift right click the folder after extraction and open command line here.
Then in command line type
but wait if you have not turned on debug mode by clicking the serial number 7 times this wont work so go do that first.
now do you see it?
Now the command to remove the adds is
pm clear --user 0 com.amazon.kindle.kso
Reboot and you are done!