[jch1511]

Greetings,

I had the same USB cable beeping issue. Per dealer shop foreman, it has nothing to do with the cable itself. Rather, the head unit did not put out enough ampere to the armrest USB.

When dealer recently replaced my head unit under warranty due to repeated system crash and reboot, the USB issue got resolved as well. Shop foreman mentioned that the replacement unit has a newer design that solved the USB issue.

My dealer stated BMW will not fix the USB issue on it's own. However, if you are lucky enough to have your defective head unit replaced with a newer version, the USB problem fix is part of the update.

Hope my experience can help some of you folks.