Just dumped the firmware of an IXUS 950 IS (Powershot SD850 IS) through blinking LED and serial port:
http://www.zshare.net/download/6507364cb1d551/General info on this camera is available here:
http://www.dpreview.com/news/0705/07050702canonsd850is.aspFW version screens:
Canon DIGITAL IXUS 950 IS
P-ID: 314B PAL V
Firmware Ver GM1.00C
No error
Mar 27 2007 13:40:57
Adj Ver.009.000
IS Firm Ver. 2.80
IS Param Ver. 2.30
I intend to slowly analyze it, allowing for the absence of experience and limited brain capacity...
Meanwhile, I hope that some of the Respected Elders may have a look...
Perhaps find out what, if any, is the closest supported camera/FW...