If you update to 6.2.2 and use BurritoRoot2 you'll find that KFU doesn't work. I got around it by doing this prior to running it (and if KFU does something that reboots the Kindle, you'll need to do it again prior to doing anything else in KFU)
adb shell ./data/local/BurritoRoot2.bin
Once you do that, KFU does all the other stuff correctly, including reinstall all the apps with Market/Facebook/etc. and installing TWRP. Once KFU has been updated to use BurritoRoot2 it won't be a big deal. Hope this helps anyone who's trying to get back to where they were after the OTA update.
At first I was confused but I figured somehow the update went through. And sure enough after it restarted I was at 6.2.2, lost root, and twrp. So Ive been scrambling ever since trying to get it back to what it was. I was able to use burritoroot2 to get rooted again. And Ive spent hours reading and trying to install twrp again and finally found your post. So I guess now its just wait until KFU gets updated to be able to install twrp after 6.2.2?
So my question is, after Im able to get twrp back is there any sure fire way to block the OTA? Because I want to keep it at rooted stock. I saw this thread here, http://forum.xda-developers.com/show....php?t=1451747 but it doesnt prevent ota. So other than a custom rom is there a way to prevent amazon from sabotaging my device? Thanks