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Hi all.
I've recently bought a 32GB Verbatim USB Key with a PHISON controller: PS2251-67 (PS2267).
I've tried to write an ISO image on it by using MPALL v 3.60.0B and it worked without problems. Suddently I've created an ini with only one partition as fixed disk. All worked fine: the key is now seen as a fixed drive but now MPALL cannot recognize it!
I decided to low format it hoping the key will return removable: the only compatibile tool I've found is the Silicon Power Low Level Formatter.
I've formatted it but:

The drive still be fixed
Sometimes it gives me errors when I format it with the Windows tool (sometimes the capacity of the key decreases even if there isn't anything on the key)

What can I do? 

Try CTool, for example CTool 90AP v3.17.
If no recognize too, then test-mode and fw

I've tried the CTool, but it doesn't work 
I haven't understand how to do the test-mode and fw 

I've resolved using the Silicon Power UFD Recover Tool v5 

I've resolved using the Silicon Power UFD Recover Tool v5 

This is beautiful. Your experience will be useful to other people with the same problem.