It is posted somewhere in this forum, but it took me sometime to find it
http://kightlinger.net/files/personal/car/documents/AVIC%20Z2%20Unit/Manuals/AVIC%20Z2%20-%20Service%20Manual.pdf
Many Thanks for all those who are contributing in this forum
I wish I can contribute something here...
Since I have all the unlocked maps of TeleNav I will try to load them on the Z2 (once I unlock the disk)...It will be a breakthrough if this would work..then we can load any map for any country and we can have even the 2010 maps loaded without waiting for Pioneer !!