I've used the thumb drive (that I've sent to the OP) in my 2015 FLHTK and my 2019 FLHTK, both times without issues. All files are in MP3 and M4A format and are dumped directly onto the root drive with nothing else on the thumb drive. The thumb drive should be delivered today so hopefully if Leonard has the time, he'll be able to test things out and report back to us.

 

Looks like you have it covered. I will be sitting by waiting for the determination also. Hope this determines the issue.

 

But the stereo is not necessary forward compatible...I have a Kenwood marine stereo on my toyhauler that won't read 3.0 sticks...just gives error code...

 

Thank you CSMHOG!!!! It works real good.

 

Good to hear! Enjoy it ... really good to know everything is working as it should.