Advertising a better map protection to break it later? I'm not THAT sophisticated! And Garmin could make the protection unbreakable by digitally signing their firmwares, like Apple does. Though Apple's devices are frequently jailbroken, Garmin could make it better.
By the way, "so why ..." translates like "Итак, почему ... ?". You'd better say "that's why ..." in this case.