Chances are you had the same thing happened that I have experienced a couple times since I did the latest update with the fob lock security feature. If you accidentally hit lock on the fob, after getting in the truck, before or during starting it will do all that's and your truck will be locked out to prevent theft. What I have found is shut truck off, open door, wait 1 minute. Hit unlock on the fob, then shut the door and restart the truck. It clears every time.
Chances are, since you have done all the other stuff, with removing Tazer, updating firmware, unhooking battery, you may have completely locked yourself out.
Just for troubleshooting sake, reinstall the Tazer, then lock and unlock the doors with the same fob as you used beforez and see if that helps.