So it was not the EFS, cause Boeffla uses a EFSv1 Modem too, it was the different ramfs you need to use. OK I had never any problems with my IMEI, but after the talk here in this thread I thought it was to use EFSv1 and as you can see on Andi's footer, he runs XXUGND2 with modem XXDLIB.

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