Take the old one out make sure your doors are unlocked before you disconnect it. Put the new one in, tighten and fix your clock on your instrument cluster. The ECU relearns everything if cleared as you drive. It's a battery swap not a bypass surgery. They try to make it sound more complicated then it actually is because they want your money.
330i | M Technik | BBS 197 | 3D Studie | H&R