ItAntMe, if your Kindle had JB and installed JB hotfix/bridge, then you just need to reboot TWICE to let the hotfix/bridge do the magic.
There are a few KUAL extensions that are designed to block the OTA, but I recommend this renameotabin.zip from hius07
to block the OTA update (
https://www.mobileread.com/forums/sh...=327879&page=2) because this will rename the required local binaries for the OTA process.