Thanks for the guidance biggerdave.
Just before I got your last post, I got peed off and formatted the device.
I then got an old version of TT Home that doesn't want me to register etc before it will do anything, then downloaded a new navcore, and whatever updates it would, but it would NOT give me a map this time.
Luckily I had kept a copy of one it dive give me a few days ago, so I installed that and got the device working with the old map.
I then removed some lies that I didn't like from the root, like connect2internet.db, .so, .ver, statdata, and phone_database.
Then I did the new map install 945-6256, patched the navcore, patched the map/s and WALLAH!!!!! it works!!!!
I only have a couple of very minor annoyances now.
1. Every time I plug the device into the computer, it opens up a late version of TT Home that is not even installed on my 'puter!!
I cannot find which file in the root is responsible, but would love to, and bugger-it-off.
2. Despite renaming the second map Australia2, both maps show up in the devise as AUSTRALIA. No big deal, but would like to re-nmae somehow.
Happy chappy now ;-)