Lens removal on H is pretty straight forward except for heavy amount of glue / paste they use for original, note second picture. Just remove the 8 screws on the camera cover, no need to disconnect antenna as there is enough cable to put it to the side. There are two small sensors attached to red wires which need to be slide out from the holes they are in. Once you've done that plastic cover will separate from area you have lens mounted. To make the heavy glue easier to remove I used isopropyl alcohol to make it brittle then chipped it off with a dentists pick. To actually remove lens I used the smallest needle nosed Vise Grip with shrink tube attached to the gripping portion just gently adjust wrench until it's firm and twist to break seal, Then unscrew with hand. I tried using a 5.4 millimeter lens which is what I put on all my GoPros but it would not focus properly because of wrong shaft length. These lenses are called M12 Board lenses when shopping for one make sure it has 16 megapixel resolution so your 4K video quality doesn't suffer...I've reinstalled my stock lens for now and communicated with lens manufacturers about a 5.4 lens which will fit. Instead of the stock 98 degree field of view the 5.4 will give you an undistorted flat field view of 64 degrees. Other shorter focal lengths like 3.9 mm are available now but I'm hoping to use a 5.4. By the way the mm equivalent in 35mm camera lens terms simply multiply the mm size by 4...for example the 5.4 mm would be about a 21mm 35mm lens equivalent. I've added a shot of the tools I used for lens change.