All this will work naturally if you rooted your device first...

1) Remove Kindle Fire by hacking trick First, you need to root 
your Kindle Fire. Please refer to this article for the rooting 
tutorial: How to root Kindle Fire Open ES File Explorer and go 
to /system/app. You can find an app called Dtcp_apk.apk.. This 
app is used for displaying app. We need to disable it. Rename 
the app as .Dtcp_apk.bat.. Now the Kindle Fire cant call the ad 
app any longer.

2) Remove certificates : ES File Explorer will function like a 
full-fledged root browser. Use the Up button to navigate to the 
/system/etc/security/ directory/. From there either delete 
otacerts.zip, or move otacerts.zip to the downloads folder for 
safe keeping. You could technically store otacerts.zip anywhere, 
it just needs to not be in the security folder if you want to 
keep the Kindle Fire from automatically updating.