[Q] How to safely mod the Apollo build.prop?
I rooted my 8.9 HDX a few months ago, and when the latest two updates started being released, I put it into airplane mode, defeating the reason for having a tablet. I am running Safestrap with the rooted stock rom installed in a rom slot, X-posed module intalled, Android firewall setup, and all those things that were originally thought to prevent update, but I know that as soon as I turn on Wi-Fi it will get updated. I understand that modifying the build.prop is currently the only way to prevent the update, but I can't find (and yes, I have searched the forum) the correct way to safely mod it.
Can someone please post a short tutorial for safely modding the build.prop for the 8.9HDX? Any help would greatly be appreciated.