I had exactly the same issue. The only thing that fixed it after disconnecting 12v battery and holding home button for 10 seconds, was to go into settings menu and ‘reset to factory settings’ this has fixed the issue.
Hi, I’ve just solved this exact issue with my MG4 after disconnecting the 12v battery and holding the home button for 10 seconds to reboot the infotainment system, I was still getting the USB error. Went into setting and ‘reset to factory settings’ and it’s fixed the issue.
I fixed the same...
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