[fantomel]

All i can tell you is that long time ago , when titoun helped me a lot, i found also another reference, that one also with 2 different marks B and C on original tools. The thing is that last version of that checker that is on all internet has "some" bugs, meaning on one of references it presumes that is a B always even if inside is a C model, or gives unknown version, when in fact that interface is an original one, with original serial and original C model. So, from this.... that new checker is bugged, better look for an older version that identifies the tool proper.
My clone, that was one full, reworked from scratch, rewritten from scratch, that now has identical reference from one original and serial on it, it's still seen as unknown model by interface checker