But in any case there is no ALT menu, regular hangs and unstable connection with PC. Really seems as incorrect firmware or error while flashing.
And Startup splash have no image with CHDK LOGO like in my S3IS - there is only red rectangle with text.
I've to create foolproof automatic solution with G9 because it the power button removed from camera.
Just try to reflash S3 IS strictly following CHDK instruction - working fine! 
A small detail - you are not "flashing" the camera when you run CHDK. Flashing means you change the camera's permanent memory. CHDK simply loads in RAM and no permanent changes are made.
A couple of questions ? How do you know you have firmware 1.00f ? And how did you setup your SD card ? How big is it ? Did you expand the entire distribution file to the SD card ? From a Mac or PC ?
Yes, I understand, that process is not exactly flashing, but dont know short description of process =)
Version of firmware displayed when I insert locked SD card with file "ver.req" and pressing SET&DISPLAY buttons in playback mode.
I've try some methods to prepare SD.
Setup of SD card (1GB size, WIN7, cardreader Pretec AUB36P or internal cardreader of DELL Inspiron 6400 "SDA Standard Compliant SD Host Controller Vendor"):
1. formating it in camera low-lewel or with CardTricks 1.44
2. making a partition with SDM Installer or with CardTricks 1.44
3. making SD bootable
4. copying unzipped content of g9-100f-0.9.9-1379-full.zip to SD by hands or with CardTricks 1.44
5. locking SD
In result, Update Firm menu appears in camera, 1.0.0.0 -> 1.1.0.0, and seems as working but there is no ALT menu under any key of G9. Thinking that I try all keys and their combinations to find ALT menu =)
