Hi, I'm having trouble getting this figured out on my ELPH 180. Here is what I have done.
1. Formatted the sd card while in camera
2. Took a picture and stored on card
3. Plugged the card directly into my computer
4. Ran the picture through the ACID program and it came up with a firmware version of 1.00c. It showed a trunk CHDK full build and Experimentals CHDK-DE full build were available.
5. I downloaded both and separately unzipping the folders and dragging them onto the card.
6. Plugged the card back into the camera
7. Pressed the PLAY button and then the MENU button. Tried to find the firmware update option but it doesn't appear. Don't know what else to do.