I've been reading up on the Tazer and seeing where a lot of people are having battery drainage issues after installing it. Is this still a problem or has it been corrected with firmware updates?Yes, you heard correctly. Lockers are only usable in 4lo, as a firm a factory stupid proofing. I, and many others, choose to use the Tazer reprogrammer for the body control module. It's primary use is resetting tire sizes, tpms thresholds, and not having to disable auto stop start every time you fire the Jeep up. It's side benefits are rear locker in 2hi, both lockers in 4hi, full traction control kill, adjustable rpm for winch mode, and many other clever features.