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SD Card Error, now USB not working

This has happened intermittently on my '19 as well. Usual symptoms are "SD card error" and the USB ports stop working. I have one of the cheap USB nav cards as well (p/n 8681 0236)

A reset of the HMI usually fixes it. See page 267 in the manual. Access the interior fuse panel to the left of the steering wheel, behind the headlight/fog light controls. Pull fuse F42 wait a few seconds and plug back in.

This reboots the HMI and resolves whatever glitch is causing this.
 

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