I just downloaded these from the U310 forum. They are specified for the U310 but the U and the Z seem to run the same navi software so I am posting them here incase they work.
Posted Nov 30, 2009 · 08:45 UTC#1
Possible Z110BT Testmode Files Found
Posted Nov 30, 2009 · 08:50 UTC#2
Ok per the Z service manual it appears the unit needs the GGS1080 files so these probably wont work but it is a start. I will request that the source that uploaded these files to try and get the Z files as well.
Posted Dec 03, 2009 · 12:59 UTC#3
I'm really interested to see how the guy got the files. I'm pretty sure you can only download them from Pioneer's intranet. Which makes me wonder if either 1) Pioneer's network is hackable or 2) Someone on the inside doesn't care much about their job. Either way I'm not complaining. 
Posted Dec 03, 2009 · 20:40 UTC#4
Probably one of the 10,000+ people Pioneer laid-off this year 
If only he/she would help us get the rest of the way 
Posted Dec 04, 2009 · 03:59 UTC#5
this could get interesting
Posted Dec 04, 2009 · 19:49 UTC#6
This guy at the thread below may be on to something put it is for the F10BT which is the EU version of the Z110BT.
Posted Dec 08, 2009 · 01:45 UTC#7
awesome! I hope that this works out!
Posted Dec 08, 2009 · 15:49 UTC#8
2 VBLUE42
sorry for my bad english,
if you loking for testmode, you can try create file TESTMODE.KEY at SD/USB.
and/or make link to Explorer via testmode.exe/testmode.mcr(like in F-series) ?
also, use IDA or WinHex, and try looking NPSysCtrlHandler.dll and NSystemInfoLib.dll files,
i posted links in other topic. i use f900bt, so, can't test this way.