It appears the following cameras may be similar to the SX210 based on release dates:
I briefly checked the chdk wiki and none appear to have dumps yet but I haven't search the forum.
I can confirm that the A495 also is not "working".
The ver.req/vers.req info display is not working anymore on the A495.
I discovered the P-ID of this camera via the usb-id and tryd to create a PS.FI2 file with d3 or d4 keys,
but the camera does not accept this "firmware-update", shows only a error.
Also no success getting a diskboot.bin file (led blinker software/modified udumper) running
with dancingbits encoding 1/2/3.
So i also guess that canon changed the keys&dancingbits values for the cameras released in 2010.