QL-800 Appears as Mass Storage, not Printer

[alexspurling]

When I connect the Brother QL-800 to my Ubuntu 18.04 installation, the device appears as a mass storage device, rather than a printer. As a result, brother_ql does not list it as an available device. This occurs whether or not I have installed the Linux printer drivers. How can I tell Ubuntu to recognise the USB device as a printer rather than mass storage? Here is the output of lsusb -v for this device:

Bus 001 Device 016: ID 04f9:209e Brother Industries, Ltd 
Couldn't open device, some information will be missing
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x04f9 Brother Industries, Ltd
  idProduct          0x209e 
  bcdDevice            1.00
  iManufacturer           1 
  iProduct                2 
  iSerial                 3 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xc0
      Self Powered
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0

[alexspurling]

I found the problem! I had the "Editor Lite" option enabled on the printer itself which is apparently a way to distribute the Windows / MacOS software by appearing as a removable drive. Disconnecting the printer, pressing the "Editor Lite" button so that the green light is off and then re-connecting the printer allowed it to appear as a printer device rather than a USB device.