: The most recent official map data is based on Q3/18 data (released as the 2019 version). Support for newer map releases on this specific hardware platform has largely been discontinued. Alternative Update Options
Only download from sources with a comment section. If a website offers a 1-click download for "Navi 900 2025" but has no forum discussion, it is likely a virus or a broken file. Use a VPN, scan the archive with Windows Defender, and always back up your original map data (via Developer Mode) before flashing.
Are you interested in if it’s not already enabled? Astra 2016 GPS Navigation System Map Updates