I also just got an Ixus80 (from Hong Kong, don't know if it makes any difference). I might be able to help with dumping the firmware, I just don't know how
I've tried the udumper, and it doesn't work, screen shows "Card locked", and empty.dum is still empty.
I'm guessing the blinker method will not work either, since we first need to find out how to execute code from the SD card...