It have been interesting two hours!
I did backup Nuvi NV (region41) with sd and it did work perfectly!
Then I did change back to the original logo.bin and after that I could choose the TTS-voices again!
It seems that after changing the logo.bin to some Opel logo.bin the TTS-voices became unuseable.
And someone of the former users did choose "nuvi 7x5" as the bluetooth name of this 1490....
All problems solved! Thank you for your help!
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