The wrong CHDK bootdisk address comes from the ML setting. You can change the address by clicking on the CHDK and ML images.
You're right… Thanks…
But as you can see from the first pictures, CHDK was already selected ...
The order is the problem. You first have to select CHDK and then select BOOTDISK.
If you select BOOTDISK first, then CHDK is automatically selected but with the wrong address.