I followed the same steps I used to get it working the G15, but for some reason it won't work on these other cameras.
Any idea would be greatly appreciated.
If you just need a "Simple" way to make the SD cards bootable you can use the CHDK
"SD Boot" utility in your camera that has the Firmware Update Method that works.
You can then make, the now Bootable SD, into a "Dual Boot" by a simple hack.
By making temporary changes to any file by changing the 8.3 "Fat 12/16/32"
"Names.DOS" to "Names~DOS" or "Names&DOS" or "Names!DOS".
Some Examples:-
DISKBOOT.BIN to DISKBOOT~BIN for the camera that the Firmware Update Method worked.
and then the reverse
DISKBOOT&BIN to DISKBOOT.BIN for the camera that the Firmware Update Method Failed.
its also a good idea to have File~txt and File&txt that contain the relevant details. Very
useful if you need to do this for a number of spare SD cards. [File = "G15" etc. etc.]
CHDK will only boot with the valid DISKBOOT.BIN file, the DISKBOOT~BIN and DISKBOOT&BIN
files are simply just ignored. Any setup files in the CHDK folder might also need to be hacked
but as most of the CHDK are common to both camera they remain un-hacked.
H-H
Edit #1
W-W Reply #1
"..Re-reading your post, I have a very obvious question. Where did you download the three different CHDK distribution zip files from (one for each of your cameras).."
See above Method for "Tripple" CHDK Booting
Examples:-
#1 DISKBOOT&BIN, File&txt
#2 DISKBOOT~BIN, File~txt
#3 DISKBOOT!BIN, File!txt