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Thanks gents!
I may have also figured out why the usb stick I tried wasn't recognized; it was formatted exfat rather than fat32. BMW doesn't like this common format. FAT and FAT32 only. Also Mac computers don't format fat32 without a bit of hacking. TIL. Also no bit rates over 256 Mbps allowed. MP3, AAC, WMA and WAV ok. FLAC, ALAC, etc are not supported.
For BT, combox is required, but was that fitted standard after a given year? I didn't see it on the vin report for a 2015 35is which was otherwise loaded.
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