Well I only have one camera (new) now with H265, I "doubt" it'll be a firmware update to get it on my older ones. I have another camera showing signs of failing now & I suspect when it is replaced, H265 will be one of the options as it is now with my latest. I am suggesting to "future proof" yourself now. Like myself, I suspect you'll need to replace a camera or two down the road as I am now. Just age & weather I suspect taking their toll.