Install CHDK on Canon camera from Mac when Firmware Update does not show up in the menus CHDK is a tool for making a camera do pretty much anything. Instead of the prebaked functionality created by the camera manufacturer, CHDK is a geeks tool letting you write programs that run on the camera, or otherwise tweak any setting. At least that's what the project promised. I bought a cheap Canon PowerShot A4000 to try it out, but couldn't get the instructions to work. Turns out the solution was easy.