But from what the link says if the device is locked then there is nothing I can do?
I installed one of the versions of igo linked in that post but not with maintaining existing folder structure.
I'll recopy the igo from my original SD Card and try again.

There is a core OS on the device itself that has some settings and it allows you whether to pick Offroad or Street mode.

The applications that load then are stored on an SD Card.

The offroad mode loads either OziExplorer or there own vms.exe GPS depending on the settings under the GPS link in the top right.

The Street mode loads igo from SDMMC\Drive\drive.exe