I have a Rollei 6008 Integral 2. It came with one magazin/back, which works fine.

I bought a 6006 back, which I know won't communicate ISO automatically with the body but should still work. The problem is that I've read that it's supposed to default to ISO 100 when it can't detect a back (or a 6006 back is used). It's not - it's defaulting to ISO 25.

Any idea why this would happen or how I can change it to default to ISO 100?