the .dem file to the device’s internal or SD card memory in the folder: \iGO\content\dem\ or \iGO8\dem\ .
the terrain in the software settings by going to Settings > Map > Terrain Settings and selecting the specific "Europe 83 CGIAR Premium" file. Europe 83 CGIAR Premium 090323.dem
The sequence "090323" acts as the timestamp. Interpreting the format (likely DDMMYY or MMDDYY), this points to March 9, 2023 (or September 3, 2023). this points to March 9