How did you contact Cressi? I sent a message through their website and they're making me go through a local dealer.
I'd say it's not worth it. Get a local computer geek to zap it w/ 3.3V off of a PC power supply, if that doesn't wake it up: throw it out: it'll suck as a backup for ZH-L or PZ or DSAT device, it sucks at deco, it needs an expensive and poorly supported IR receiver to get the data off, and so on.