the problem will probably not be the KML itself, but the installation of a version with data/files from another device (e.g. save folder)
Since iGO 8.3 there hasn't actually been a version that I haven't tested on various devices - and under which no KML was recognized. There were often problems because of unadapted data.zip or voice files.
So IMO first look for the error in the system structure?
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