I have just joined the CHDK adventure, so, please, be nice if I make mistakes
I have bought 2 a495 to do 3D photos.
I have dumped my firmware, they are identical except the last bytes but I suppose it's due to the generic dumper.
According to CameraVersion13.exe, the firmware vesrion is 100F for both of them.
I have found the DRYOS version 2.3, release #0043 in my dump (I'm now working only on one version, I suppose they are the same, Am I wrong ?)
Cool, it seems I have same version as yours, at first, thanks to all for all your great work.
I will test CHDK and try to help you if I can.