But i can not use override shutter speed. I tried everything but it will not work. Where is my mistake? With v5 it worked very well
Check your settings...
"Disable Overrides" (not [on]),
"Override Shutter speed" + "Value Factor" / Shutterspeed enum type"
(e.g. with "Shutter speed enum type" set to [Ev Step], you also have to enable the override by setting a "Value factor")
You should also use a clean CHDK config file -> rename or delete
\CHDK\cchdk.cfg on the SD card, a new config file with default values will be created on the next CHDK start.