Well, that's kind of crazy. Not sure if I should try this or not. The paid firmware message and Yellow (!) symbol is splashed right across the top of that link.
I'd hate to download this and find out my Z no longer works without paying HP $700.00. I also noticed that my firmware version 7_0_0_3 was released in Jan 2009. Version 7_0_0_5 was released in May 2009, and this version 7_0_0_7 appears to have been released in July 2009.
I think that was the last firmware update ever released for the z3100 IIRC. 2009 - Sheesh, time flies. That's why it doesn't show Win7 compatibility, only Vista. I know it works with either.
Leigh
zippski