There should be a warning that not all Powershot cameras are compatible with CHDK, like in the A90 family, there's only the 100 D and the 100 F versions available here:
Yes, of course, as you found out, people wanting to run CHDK alongside the stock Canon firmware (they co-exist peacefully) should have a look at the CHDK Wiki (http://chdk.wikia.com/wiki/CHDK
) and make note of which models and, within those models, which firmware is supported. Not all firmwares within a model series are supported, but new versions are added as the developers progress.
You can run a program called ACID
) on an image taken with the camera to determine the firmware version and subsequently ACID will download the appropriate software if available. Alternatively, you can take a blank, freshly formatted blank SD card (some cameras may want a single picture on the card...read the Wiki) with an empty file(s) named "ver.req
" and/or "vers.req
", load it into the camera, and press the appropriate buttons (dependent upon camera model) to read the firmware version.
All the info is in the Wiki, on YouTube, how-tos on http://www.Instructables.com
, or just Google CHDK. The amount of info available is a bit overwhelming but digestible in small doses.