The end with the wrap or perhaps the "terminator" in the foil at the base on the strip next to the outer jacket is often hard to see and to uncover. If you will discover this "terminator," you may nick it with a small Slice with a knife and peel https://dienphucthinh.webflow.io/posts/cap-quang-panduit-chinh-hang-tai-dien-phuc-thinh