XS++ 3.1 Guide-Flashing, Customizing, Recovering

[o0ops]

I'm a bit puzzled.
I tried XS++ 3.1 (Darwin) on my French SFR locked and branded K800i, it proposes me to upgrade to CID52 (it's CID51), I can provide a screenshot anytime if you like to.

But my question is : of what use is it to upgrade to CID52 ?

I've read somewhere it allowed to unlock the handset (for some mysterious reasons SFR won't give me the unlock code) but it's done with Setool3 which I don't have.

Can help?

THX.