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This branch gave midi2_device a high-speed configuration (master had none) without tud_descriptor_device_qualifier_cb or tud_descriptor_other_speed_configuration_cb, leaving usbd's weak stubs returning NULL so GET_DESCRIPTOR(DEVICE_QUALIFIER) stalled EP0 - which USB 2.0 9.6.2 forbids for a device reporting bcdUSB 0x0200. Both callbacks now follow the pattern every other example with an HS config uses.