Thank you, I understand your concern, but Pioneer hasn't changes any software on the 8400 or appradio2 regarding the bypasses. I have both of these radios, and the microbypass interfaces work perfectly on both. Our store is the one of the top Pioneer retailers in all of Florida, and we now use these microbypasses on every Pioneer radio install we do. They are just as cheap as a tr7, and you don't have to program them. They are simple three wire connections and work right out of the box. The original appradio1 is the only one that has issues with bypasses and has software changed (i heard their