Thanks a ton, Maybe now its possible to see everything that needs to be changed for CHDK to run, so maybe the wiki can get a proper porting guide that is complete.
Thank, thank JTLG

...but test my realease before express gratitude

I hope finish soon my wiki/porting page...but I'm very busy at the moment...and I also would study some guide
"photography for dummies" because i'm a classical user that set his cam in AUTO mode

synthesilica is it no too late for try chdk?!
sorry, but in italy (my country) was 4:00 PM...
mhhh... thank for error reporting!
I tried some script and many worked fine. For bracketing i see also focus don't work...I'm sure that work ISO bracketing at the moment!
one hit:
try bracketing in Extra Photo Operations > Bracketing in Continuous Mode (firmware is Allbest)
a last thing:
I have created a section named 'Bugs Report' in a550 wiki page and add your report.
For next one everyone can add it to wiki and then explain in detail on this forum