As mentioned, I have a Start 52 Navigation device. It was working well for 1-2 years and, when switching it on again, there was "No Map Available" error. I have been updating this regularly and have just under 6GB free on the device. Naturally, I assumed this was because of some corruption/purchase expiry. I reconnected to mydrive connect, and updated all updates. The map is displayed as "installed" and not "corrupted". I followed all procedures on the video but cannot even uninstall the map. The map is still displayed as installed on mydrive connect and all updates were passed onto my device.