What is the AT command to change the USB speed?

IoT Modules MC/EM Series
2

Wild guess:

at!usbspeed?
SUPPORTED:Super-Speed
CURRENT  :High-Speed

OK
at!usbspeed=?
!USBSPEED: <max_supported_speed>
<max_supported_speed>:
  0 - High Speed
  1 - Super Speed

OK
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