you still dont understand. we understood your problem, and we try to help you.
there seems to be something wrong with your camera, and it is not related to chdk, but with the "write-protection detection" of it. this problem would also have occured if you injected an sdcard WITHOUT chdk, just write-protected. do you get now what we are trying to tell you?
try fiddling around in the card department with something non-metallic, probably a toothpick or something, there seems to be something stuck.
