I can prepare you a simple unlock for this device, but you need to send me full backup of device flash disk so I can see and modify the file structure. You can exclude maps to minimize the size. Compress all files with winrar and upload the archive on a public server, such is Free Online Storage for your files!
no problem, we are one step closer..
select all files and folders that you see on the navman's flash disk, than copy all to your PC and finally compress backup folder with winrar. When your package is ready, you can upload it to Free Online Storage for your files! and share the link for download. That's it!