by Fatboyfun » Tue Nov 12, 2013 8:27 pm
You don't need an unlock to do that.
If you connect the device to your pc you will see a folder called EITHER ResidentFlash OR DataFlash.
Inside this folder will be another folder called MobileNavigator, and inside this folder a file called MobileNavigator.exe
This is the original application, and you just need to replace the contents of the MobileNavigator folder with iGO, and rename iGO.exe to MobileNavigator.exe.
It is safe to delete everything from the internal flash memory (ResidentFlash or DataFlash) and replace it.
However if the device is connecting via ActiveSync or Windows Mobile device Center getting the new application and maps into the device will be an interesting experience.
I suggest running total commander from a SD card and using that to transfer the new app from the SD card to the internal flash.
You may also find the flash memory isn't that big, could be as little as 256MB.