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Topics - Tiziano

I'm a longtime FlashMagic user and now I have no answers about a trouble that happens!
The problem is in P89CV51RC2 parts because are not programmable in ISP mode and does not respond even to blank check.  >:(
The wiring is OK (I'm using a burn-in socket to easy changing of different microprocessors) and I have no problem with other parts (i.e. P89CV51RD2).
With the signal analyzer I can see the "U" sent by PC but there are no answer from the part.  I tried to program more parts of same stock but none is programmable.
I don't know if the part is switching or not in ISP or if the problem is elsewhere.    Could be maybe a problem on bootloader?
Any ideas?  May you suggest an action?
Thank you