The HTC One M9 has one huge issue, its terrible camera. HTC has just released a software update that brings huge improvements to the camera, the HTC One M9 camera update has build number 1.32.531.33 (Taking up 88Mb) will be available OTA and will bring huge improvements to the camera.
The HTC One M9 rocks a 20 Megapixel Rear facing camera with autofocus and dual-LED (dual tone) flash. Despite sounding great on paper, it turned out to be a huge disappointment once it came to actually making photos. This is something HTC has successfully addressed in the 1.32.531.33 HTC One M9 camera update
Bellow are a series of photos, on the left are made with the HTC One M9 without having the recent update installed and on the right are pictures taken with the HTC One M9 that has the new HTC One M9 camera update installed. Source
If you want to download the HTC One M9 camera update, it is not yet available. It will roll out over the next couple of days depending on who your carrier is.