Extract files on the root of SD card.
For K10D,K20D,K200D & K7D : Open SD trap door while powering the device.
For Km & K2000 : press "Delete" during turn-on.
Enable debug mode : Press right key to change <DIS> to <EN> on the DEBUG MODE line.
Dark Frame substraction is now off.
If you switch off and on the camera, you will have to press "OK" to validate the settings.
If you want to come back to standard behaviour, set "DEBUG MODE" back to <DIS>.
DFS is now as previously.